Clerke, Agnes M. A Popular History of Astronomy During the Nineteenth Century. London, 1902.
Headley, Leal and Merrill Jarchow. Carleton: The First Century. Northfield, 1966.
Leonard, Delavan. The History of Carleton College. Chicago, 1904.
Osterbrock, Donald. James E. Keeler: Pioneer American Astrophysicist. New York, 1984.
Pendray, G. Edward. Men, Mirrors, and Stars. New York, 1935.
Pursell, Carroll W., Jr. Astronomy In America. Chicago, 1967.
Wright, Helen. Explorer of the Universe: A Biography of George Ellery Hale. New York, 1966
Algol. 1889-1945. Astronomy and Astrophysics. Vols. 11-13,1892-94.
Barnard, E.E. "Development of Photography in Astronomy," Science. Vol.8 (September 16-23,1898), pp.341-53; 386-95.
Carleton College Alumni Magazine. 1910-32. Carletonian. Vols. 1- 90,18771970.
Holden, Edward S. "America's Achievements in Astronomy," Forum. Vol.15 (August 1893), pp.744-52. Popular Astronomy. Vols. 1-59,1893-1951. Sidereal Messenger. Vols. 1-10, 1882- 1891.
UNPUBLISHED SOURCES IN THE CARLETON COLLEGE ARCHIVES
Annual Reports of the Director of the Observatory, 1910-65.
Correspondence and conversations with Prof. Owen Gingerich (HarvardSmithsonian Center for Astrophysics), Prof. John Lankford (Department of History, University of Missouri), Prof. Joel Weisberg (Department of Physics and Astronomy, Carleton College), Prof. Emeritus Robert T. Mathews (Carleton College).
Minutes of the Board of Trustees, 1867-1900.
Papers of the Dean of the College, 1965-73.
President's Reports to the Board of Trustees, 1874- 1885.