Many of the references in this list were supplied by Robert W. Smith. Dr. Smith has written the excellent book "The Expanding Universe, Astronomy's `Great Debate' 1900-1931" published by Cambridge University Press. At the bottom of this listing some of the notations are explained.
Aitken, R., 1943, Heber Doust Curtis 1872 - 1942, Biogr. Mem. Nat. Acad. Sci., 22, 275-294 Badash, L., 1972, The Completeness of Nineteenth Century Science, Isis, 63, 48-58 Baily, S., 1922, Henrietta Swan Leavitt, Pop. Astron., 30, 197-199 Berendzen, R., 1975, Geocentric to Heliocentric to Galactocentric to Acentric: The Continuing Assault to the Egocentric, Vistas Astron., 17, 65-83 Berendzen, R. & Hart, R., 1973, Adriaan van Maanen's Influence on the Island Universe Theory, J. Hist. Astron., 4, 46-56 and 73-98 Berendzen, R. & Hoskin, M., 1971, Hubble's Announcement of Cepheids in Spiral Nebulae, Astron. Soc. Pac., Leaflet No. 504, June 1971 Berendzen, R. & Shamieh, C., 1973, Maanen, Adriaan van, Dict. Sci. Biogr., 8, 582-583 Berendzen, R., Hart, R., & Seeley, D., 1976, Man Discoveres the Galaxies, (Science History Publications, New York) Bok, B., 1978, Harlow Shapley, Biogr. Mem. Nat. Acad. Sci., 49, 240-291 Campbell, W., 1911, Some Peculiarities in the Motions of the Stars, Lick Obs. Bull., 6, 124-135. Campbell, W., 1917, The Nebulae, Science, 45, 513-548 Campbell, W., 1926, Do We Live In A Spiral Nebulae?, PASP, 38, 75-85 Charlier, C. 1925, An Infinite Universe, PASP, 37, 177-191 Crommelin, A., 1917, Are the Spiral Nebulae External Galaxies?, Scientia, 21, 365-376 Curtis, H., 1911, The Distances of the Stars, PASP, 23, 143-163 Curtis, H., 1915, Preliminary Note on the Nebular Proper Motions, Proc. Nat. Acad. Sci., 1, 10-12 Curtis, H., 1915, Proper Motions of the Nebulae, PASP, 27, 214-218 Curtis, H., 1917, The Nebulae, PASP, 29, 91-103 Curtis, H., 1917, New Stars in Spiral Nebulae, PASP, 29, 180-182 Curtis, H. 1917, Three Novae in Spiral Nebulae, Lick Obs. Bull., 9, 108-110 Curtis, H., 1921, The Scale of the Universe, Bull. Nat. Res. Counc., 2, part 3, 194-217 Curtis, H., 1924, The Spiral Nebulae and the Constitution of the Universe, Scientia, 35, 1-9 Douglas, A., 1956, The Life of Arthur Stanley Eddington, (Nelson: London) Easton, C., 1913, A Photographic Chart of the Milky Way and the Spiral Structure of the Galactic System, ApJ, 37, 105-118 Eddington, A., 1916, Internal Motions in a Spiral Nebula, The Observatory, 39, 514-515 Eddington, A., 1917, The Motions of Spiral Nebulae, MNRAS, 77, 375-377 Eddington, A., 1933, The Expanding Universe, (Cambridge University Press: Cambridge) Fath, E., 1910, The Distribution of Nebulae and Globular Star Clusters, Pop. Astron., 18, 544-548 Fath, E., 1914, A Study of Nebulae, AJ, 28, 75-86 Fernie, J., 1969, The Period - Luminosity Relation: A Historical Review, PASP, 81, 707-731 Fernie, J., 1970, The Historical Quest for the Nature of the Spiral Nebulae, PASP, 82, 1189-1230 Gaposchkin, S. & Payne-Gaposchkin, C., 1966, Variable Stars in the Small Magellanic Cloud, Smithsonian Contrib. Ap., 9, 1-205 Gingerich, O., 1973, Harlow Shapley and Mount Wilson, Amer. Acad. Arts, Sci. Bull., 26, 10-24 Gingerich, O., 1975, Shapley, Harlow, Dict. Sci. Biogr., 12, 345-352 Hale, G., 1916, Annual Report of the Director of Mount Wilson, Yearbook Carnegie Inst. Wash., No. 15, 227-272 Hale, G., 1922, The New Heavens, (Scribner and Sons: New York) Hall, J., 1970, Vesto Melvin Slipher, 1875-1969, Yearbook. Amer. Phil. Soc., 161-166 Heatherington, N., 1972, Adriaan van Maanen and Internal Motions in Spiral Nebulae: A Historical Review, Quart. J. Roy. Astron. Soc., 13, 25-39 Heatherington, N., 1974, Adriaan van Maanen on the Significance of Internal Motions in Spiral Nebulae, J. Hist. Astron., 5, 52-53 Heatherington, N., 1975, The Simultaneous `Discovery' of Internal Motions in Spiral Nebulae, J. Hist. Astron., 6, 115-125 Hoskin, M., 1968, Edwin Hubble and the Existence of External Galaxies, Actes du XII Congres International d'Histoire des Sciences, 49-53 (Albert Blanchard: Paris) Hoskin, M., 1976a, Ritchey, Curtis and the Discovery of Novae in Spiral Nebulae, J. Hist. Astron., 7, 47-53 Hoskin, M., 1976, The `Great Debate': What Really Happened, J. Hist. Astron., 7, 169-182 Hoyt, W., 1980, Vesto Melvin Slipher: 1875-1969, Biogr. Mem. Nat. Acad. Sci., 52, 411-449 Hubble, E., 1920, Photographic Investigations of Giant Nebulae, Pub. Yerkes Observ., 4, 69-85 Hubble, E., 1925, NGC6822, A Remote Stellar System, ApJ, 62, 409-433 Hubble, E., 1926, A Spiral Nebula as a Stellar System, Messier 33, ApJ, 63, 236-274 Hubble, E., 1926, Extra-galactic Nebulae, ApJ, 64, 321-369 Hubble, E., 1929, A Spiral Nebula as a Stellar System, Messier 31, ApJ, 69, 103-158 Hubble, E., 1929, A Relation Between Distance and Radial Velocity Among Extra-Galactic Nebulae, Proc. Nat. Acad. Sci., 15, 168-173 Hubble, E., 1935, Angular Rotations of Spiral Nebulae, ApJ, 81, 334-335 Hubble, E., 1936, The Realm of the Nebulae, (Oxford University Press: Oxford) Jackson, J., 1924, On the Influence of Comparison Stars on Photographic Proper Motions, MNRAS, 84, 401-409 Jeans, J., 1917, Internal Motion in Spiral Nebulae, The Observatory, 40, 60-61 Jeans, J., 1923, Internal Motions in Spiral Nebulae, MNRAS, 84, 60-76 Jeans, J., 1925, Note on the Distances and Structure of the Spiral Nebulae, MNRAS, 85, 531-534 Jones, K., 1971, The Observational Basis for Kant's Cosmogony: A Critical Analysis, J. Hist. Astron., 2, 29-34 Kapteyn, J., 1913, On the Structure of the Universe, Scientia, 14, 345-357 Kapteyn, J., 1914, On the Individual Parallaxes of the Brighter Galactic Helium Stars in the Southern Hemisphere, Together with Considerations on the Parallax of Stars in General, ApJ, 40, 43-126 Kapteyn, J., 1922, First Attempt at a Theory of the Arrangement and Motion of the Sidereal System, ApJ, 55, 302-328 Kapteyn, J. & van Rhijn, P., 1920, On the Distribution of Stars in Space Especially in the High Galactic Latitudes, ApJ, 52, 23-38 Kapteyn, J. & van Rhijn, P., 1922, The Proper Motions of Delta-Cephei Stars and the Distances of the Globular Clusters, Bull. Astron. Inst. Neth., 1, 37-42 Keeler, J., 1894, Spectroscopic Observations of Nebulae, Lick Pub., 3, 161-229 Keeler, J., 1900, The Crossley Reflector of the Lick Observatory, ApJ, 11, 325-349 Kostinsky, S., 1917, Probable Motions in the Spiral Nebulae Messier 51 (Canes Venatici) Found with the Stereo-Comparator, Preliminary Communication, MNRAS, 77, 233-234 Lampland, C. 1916, Preliminary Measures of the Spiral Nebula NGC 5194 (M51) and NGC 4254 (M99) for Proper Motion and Rotation, Pop. Astron., 24, 667-668 Lampland, C., 1918, On the Proper Motion of the Virgo Nebula NGC 4594, Pub. Amer. Astron. Soc., 3, 83-84 Leavitt, H., 1908, 1777 Variables in the Magellanic Clouds, Harvard Coll. Obs. Annals, 60, 87-108 Lindblad, B., 1925, On the Cause of Star-Streaming, ApJ, 62, 191-197 Lindblad, B., 1927, On the Nature of Spiral Nebulae, MNRAS, 87, 420-426 Lindemann, F., 1923, Note on the Constitution of the Spiral Nebulae, MNRAS, 83, 354-359 Lundmark, K., 1920, The Relations of the Globular Clusters and Spiral Nebulae to the Stellar System. An Attempt to Estimate their Parallaxes, Kungl Svenska Vetensamps Akademiens Handlingar, Band 60, No. 8 Lundmark, K., 1921, The Spiral Nebula Messier 33, PASP, 33, 324-327 Luyten, W., 1926, Island Universes, Natural History, 26, 386-391 Maanen, A. van, 1916, Preliminary Evidence of Internal Motion in the Spiral Nebula Messier 101, ApJ, 44, 210-228 Maanen, A. van, 1921, Investigations on Proper Motion, Fifth Paper: Internal Motion in the Spiral Nebula Messier 81, ApJ, 54, 347-356 Maanen, A. van, 1927, Investigations on Proper Motion, Twelfth Paper: The Proper Motions and Internal Motions of Messier 2, 13, and 56, ApJ, 66, 89-112 Maanen, A. van, 1930, Investigations on Proper Motion, Sixteenth Paper: The Proper Motion of Messier 51, MGC 5194, Contrib. Mount Wilson Solar Obs., No. 408. Maanen, A. van, 1935, Internal Motions in Spiral Nebulae, ApJ, 81, 336-337 Macpherson, H., 1916, Some Problems of Astronomy - XXII - The Nature of Spiral Nebulae, The Observatory, 39, 131-134 Mayall, N., 1970, Edwin Powell Hubble, Biogr. Mem. Nat. Acad. Sci., 41, 175-214 McLaughlin, D., 1922, The Present Position of the Island Universe Theory of the Spiral Nebulae, Pop. Astron., 30, 286-295 and 327-339 McMath, R., 1944, Heber Doust Curtis, ApJ, 99, 245-248 Newcomb, S., 1888, The Place of Astronomy Among the Sciences, Sidereal Messenger, 7, 14-20 and 65-73 Oort, J., 1972, The development of Our Insight Into the Structure of the Galaxy between 1920 and 1940, Annals N. Y. Acad. Sci., 198, 255-266 Opik, E., 1922, An Estimate of the Distance of the Andromeda Nebula, ApJ, 55, 406-410 Paddock, G., 1916, The Relation of the System of Stars to the Spiral Nebulae, PASP, 28, 109-115 Pease, F., 1916, The Rotation and Radial Velocity of the Spiral Nebula NGC 4594, PASP, 46, 24-55 Philips, T., 1918, Variable Stars, MNRAS, 78, 306-309 Pickering, E., 1895, A New Star in Centaurus, Harvard Coll. Obs. Circ., No. 4, 20 December 1895 Plaskett, J., 1911, Some Recent Interesting Developments in Astronomy, J. Roy. Soc. Can., 5, 245-265 Plaskett, J., 1928, The Rotation of the Galaxy, MNRAS, 88, 395-403 Proctor, R., 1869, Distribution of the Nebulae, MNRAS, 29, 337-344 Puiseux, P., 1913, The Spiral Nebulae, Annual Report of the Board of Regents of the Smithsonian Institution, 1912 Reynolds, J., 1916, The Nature of Spiral Nebulae, The Observatory, 39, 174-175 Reynolds, J., 1917, Motion in the Spiral Nebulae M101 and NGC 4954, The Observatory, 40, 131-132 Reynolds, J., 1920, The Galactic Distribution of the Large Spiral Nebulae, MNRAS, 81, 129-131 Reynolds, J., 1922, The Planes of Spiral Nebulae in Relation to the Line of Sight, MNRAS, 82, 510-513 Ritchey, G., 1910, On Some Methods and Results in Direct Photography with the 60-inch Reflecting Telescope of the Mount Wilson Observatory, ApJ, 32, 26-35 Russell, H., 1913, Notes on the Real Brightness of Variable Stars, Science, 37, 651-652 Russell, H. & Shapley, H., 1914, On the Distribution of Eclipsing Variable Stars in Space, ApJ, 40, 417-434 Sanford, R., 1917, On Some Relations of the Spiral Nebulae to the Milky Way, Lick Obs. Bull., 9, 80-91 Scheiner, J., 1899, On the Spectrum of the Great Nebula in Andromeda, ApJ, 9, 149-150 Schouton, W., 1919, The Parallax of Some Stellar Clusters, The Observatory, 42, 112-119 Schouten, W., 1919, Probable Motions in the Spiral Nebulae Messier 51, The Observatory, 42, 441-444 Seares, F., 1920, The Surface Brightness of the Galactic System as Seen From a Distant External Point and a Comparison with a Spiral Nebula, ApJ, 52, 162-182 Seares, F., 1946, Adriaan van Maanen, 1884-1946, PASP, 58, 89-103 Seelinger, H. von (1898) Betrachtungen Uber die Raumliche Vertheilung der Fixsterne, Abhandlungen Math.-Phys. Classe Koniglich Bayerischen Akad. Wiss., 19, 565-629 Shapley, H., 1914, On the Nature and Cause of Cepheid Variation, ApJ, 40, 448-465 Shapley, H., 1917, Note on the Magnitudes of Novae in Spiral Nebulae, PASP, 29, 213-217 Shapley, H., 1918, Globular Clusters and the Structure of the Galactic System, PASP, 30, 42-54 Shapley, H., 1919, Studies Based on the Colors and Magnitudes in Stellar Clusters. Twelfth Paper: Remarks on the Arrangement of the Sidereal Universe, ApJ, 49, 311-336 Shapley, H., 1919, On the Existence of External Galaxies, PASP, 31, 261-268 Shapley, H., 1921, The Scale of the Universe, Bull. Nat. Res. Counc., 2, part 3, 171-193 Shapley, H., 1923, The Galactic System, Pop. Astron., 31, 316-328 Shapley, H., 1927, On the Classification of Extra-galactic Nebula, Harvard, Coll. Observ. Bull., No. 849, 1 August 1927 Shapley, H., 1929, Studies of the Galactic Centre. IV. On the Transparency of the Galactic Star Clouds, Proc. Nat. Acad. Sci., 15, 174-177 Shapley, H., 1929, Note on the Velocities and Magnitudes of External Galaxies, Proc. Nat. Acad. Sci., 15, 565-570 Shapley, H., 1969, Through Rugged Ways to the Stars, (Scribner & Sons: New York) Shapley, H. & Shapley, M., 1919, Studies Based on the Colors and Magnitudes in Stellar Clusters. Fourteenth Paper: Further Remarks on the Structure of the Galactic System, ApJ, 50, 107-140 Slipher, V., 1912, On the Spectrum of the Nebula in the Pleiades, Lowell Obs. Bull., No. 55 Slipher, V., 1913, The Radial Velocity of the Andromeda Nebula, Lowell Obs. Bull., No. 58 Slipher, V., 1915, Spectrographic Observations of Nebulae, Pop. Astron., 23, 21-24 Slipher, V., 1917, Nebulae, Proc. Amer. Phil. Soc., 56, 403-409 Slipher, V., 1921, "Dreyer Nebulae No. 584 Inconceivably Distant" [an article on Slipher's measurement of the radial velocity of NGC 584], New York Times, 19 January 1921 Smith, R., 1977, Sir James Hopwood Jeans, 1877-1946, J. Brit. Astron. Ass., 88, 8-17 Stewart, L., 1913, The Structure of the Universe, J. ROy. Astron. Soc. Can., 7, 1-18 Struve, O. and Zebergs, V., 1962, Astronomy of the Twentieth Century, (Macmillan: New York) Truman, O., 1916, The Motions of the Spiral Nebulae, Pop. Astron., 24, 111-112 Very, F., 1911, Are the White Nebulae Galaxies?, Astron. Nachr., 189, 441-454 Very, F., 1912, On Stellar and Nebular Distances, Knowledge, 35, 329-332 and 373-376 Waters, S., 1873, The Distribution of the Clusters and Nebulae, MNRAS, 33, 558-559 Whitrow, G., 1972, Hubble, Edwin Powell, Dict. Sci. Biogr., 6, 528-533 Wilson, R., 1923, The Proper Motions and Mean Parallax of the Cepheid Variables, AJ, 35, 35-44 Wright, H., 1966, Explorer of the Universe, A Biography of George Ellery Hale, (Dutton: New York) Young, R. & Harper, W., 1916, The Solar Motion as Determined from the Radial Velocities of Spiral Nebulae, J. Roy. Astron. Soc. Can., 10, 134-135
AJ = The Astronomical Journal ApJ = The Astrophysical Journal MNRAS = Monthly Notices of the Royal Astronomical Society PASP = Publications of the Astronomical Society of the Pacific
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