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——. 1978. “Harlow Shapley.” Biographical Memoirs, vol. 49. Washington, D.C.: National Academy of Sciences.

Bowler, P. J., and I. R. Morus. 2005. Making Modern Science. Chicago: University of Chicago Press.

Brashear, R. W., and N. S. Hetherington. 1991. “The Hubble-van Maanen Conflict over Internal Motions in Spiral Nebulae: Yet More New Information on an Already Old Topic.” Vistas in Astronomy 34: 415-23.

Brush, S. G. 1979. “Looking Up: The Rise of Astronomy in America.” American Studies 20: 41-67.

Campbell, K. 1971. Life on Mount Hamilton, 1899-1913, ed. Elizabeth Spedding Calciano. Santa Cruz: University of California Library.

Campbell, W. W. 1900a. “James Edward Keeler.” Publications of the Astronomical Society of the Pacific 12: 139-46.

——. 1900b. “James Edward Keeler.” Astrophysical Journal 12: 239-53.

——. 1908. “Comparative Power of the 36-Inch Refractor of the Lick Observatory.” Popular Astronomy 16: 560-62.

——. 1917. “The Nebulae.” Science 45: 513-48.

Cannon, Annie J. 1915. “The Henry Draper Memorial.” Journal of the Royal Astronomical Society of Canada 9 (May-June): 203-15.

“Charles T. Yerkes Dead.” 1905. New York Times, December 30, p. 4.

Christianson, G. E. 1995. Edwin Hubble: Mariner of the Nebulae. Chicago: University of Chicago Press.

Ciufolini, I., and J. A. Wheeler. 1995. Gravitation and Inertia. Princeton, N.J.: Princeton University Press.

Clark, D. H., and M. D. H. Clark. 2004. Measuring the Cosmos. New Brunswick, N.J.: Rutgers University Press.

Clark, R. W. 1971. Einstein. New York: World Publishing Company.

Clerke, A. M. 1886. A Popular History of Astronomy During the Nineteenth Century. Edinburgh: A. & C. Black.

——. 1890. The System of the Stars. London: Longmans, Green, and Company.

——. 1902. A Popular History of Astronomy During the Nineteenth Century. London: Adam and Charles Black.

Crommelin, A. C. D. 1917. “Are the Spiral Nebulae External Galaxies?” Scientia 21: 365-76.

Cropper, W. H. 2001. Great Physicists: The Life and Times of Leading Physicists from Galileo to Hawking. Oxford: Oxford University Press.

“Crowd Jams Library for Hubble Talk.” 1927. Los Angeles Examiner, October 21.

Curtis, H. D. 1912. “Descriptions of 132 Nebulae and Clusters Photographed with the Crossley Reflector.” Lick Observatory Bulletin, no. 219: 81-84.

——. 1913. “Descriptions of 109 Nebulae and Clusters Photographed with the Crossley Reflector: Second List.” Lick Observatory Bulletin, no. 248: 43-46.

——. 1914. “Improvements in the Crossley Mounting.” Publications of the Astronomical Society of the Pacific 26: 46-51.

——. 1915. “Preliminary Note on Nebular Proper Motions.” Proceedings of the National Academy of Sciences 1 (January 15): 10-12.

——. 1917a. “A Study of Absorption Effects in the Spiral Nebulae.” Publications of the Astronomical Society of the Pacific 29: 145-46.

——. 1917b. “New Stars in Spiral Nebulae.” Publications of the Astronomical Society of the Pacific 29: 180-82.

——. 1917c. “Three Novae in Spiral Nebulae.” Lick Observatory Bulletin 9 (300): 108-10.

——. 1917d. “Novae in Spiral Nebulae and the Island Universe Theory.” Publications of the Astronomical Society of the Pacific 29: 206-7.

——. 1917e. “The Nebulae.” Publications of the Astronomical Society of the Pacific 29: 91-103.

——. 1918a. “Descriptions of 762 Nebulae and Clusters Photographed with the Crossley Reflector.” Publications of the Lick Observatory 13: 11-42.

——. 1918b. “A Study of Occulting Matter in the Spiral Nebulae.” Publications of the Lick Observatory 13: 45-54.

——. 1919. “Modern Theories of the Spiral Nebulae.” Journal of the Washington Academy of Sciences 9: 217-27.

——. 1924. “The Spiral Nebulae and the Constitution of the Universe.” Scientia 35: 1-9.

De Lapparent, V., M. J. Geller, and J. P. Huchra. 1986. “A Slice of the Universe.” Astrophysical Journal 302 (March 1): L1-L5.

Deprit, A. 1984. “Monsignor Georges Lemaître.” In The Big Bang and Georges Lemaître, ed. A. Berger. Dordrecht, Holland: D. Reidel.

De Sitter,