Some of Babcock’s papers are at the Huntington Library. The AIP Center for History of Physics has a Manuscript Autobiography (38 pp.), as well as oral interviews of Horace Babcock and others who worked with Harold Babcock.
Adams, Walter S., “Early Solar Research at Mt. Wilson,” Vistas in Astronomy 1, 619-623 (1955).
Babcock, Harold D., “George Ellery Hale,” PASP 50, 156-65 (1938).
Babcock, Harold D., “In 1903,” PASP 51, 19-23 (1939) [poem recounting first visit to Mt. Wilson].
Babcock, Horace W., “Diffraction Gratings at the Mount Wilson Observatory,” Physics Today 39, 7, 34-42 (1986).
Howard, Robert, “Eight Decades of Solar Research at Mt. Wilson,” Solar Physics 100, 1-2, 171-187 (1985).
Hufbauer, Karl, Exploring the Sun: Solar Science Since Galileo (Johns Hopkins Univ. Press, Baltimore, 1991).
Sandage, Allan, Centennial History of the Carnegie Institution of Washington. Vol. 1, The Mount Wilson Observatory: Breaking the Code of Cosmic Evolution (Cambridge Univ. Press, Cambridge, UK, 2004).
Simmons, Michael, “The History of Mount Wilson Observatory: Bringing Astronomy to an Isolated Mountaintop,” (Mt. Wilson Observatory Association, 1983).
http://www.mtwilson.edu/his/art/g1a1.php
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Babcock, Harold D., “The Zeeman effect for Chromium,” Ap.J. 34, 217-33 (1911).
Babcock, Harold D., “Note on the Grouping of Triplet Separations Produced by a Magnetic Field,” Ap.J. 34, 288-93 (1911).
St. John, Charles E. & Harold D. Babcock, “A Displacement of Arc Lines Not Due to Pressure,“ Phys. Rev. 3, 487-88 (1914).
St. John, Charles E. & Harold D. Babcock, “A Study of the Pole Effect in the Iron Arc,” Ap.J. 42, 231-62 (1915).
St. John, Charles E. & Harold D. Babcock, “The Elimination of Pole-Effect from the Source for Secondary Standards of Wave-Length,” Ap.J. 46, 138-66 (1917).
Babcock, Harold D., “Note on the Polarization of the Night Sky,” Ap.J. 50, 228-31 (1919).
St. John, Charles E. & Harold D. Babcock, “ “Wave-Lengths of Lines in the Iron Arc from Grating and Interferometer Measures λ 3370- λ 6750,” Ap.J. 53, 260-99 (1921).
St. John, Charles E. & Harold D. Babcock, “ “An Investigation of the Constancy in Wave-Length of the Atmospheric and Solar Lines,” Ap.J. 55, 36-47 (1922).
Babcock, Harold D., “A Determination of e/m from Measurements of the Zeeman Effect,” Ap.J. 58, 149-63 (1923).
Babcock, Harold D., “A Study of the Infra-Red Solar Spectrum with the Interferometer,” Ap.J. 65, 140-62 (1927).
Babcock, Harold D., “Revision of the Value of e/m Derived from Measurements of the Zeeman Effect,” Ap.J. 69, 43-48 (1929).
Babcock, Harold D., “A Photographic Study Of the Solar Spectrum in the Region λ10000 to λ11000 A,” PASP 41, 274-76 (1929).
Babcock, Harold D., “The Relative Number of Lines of Different Intensity in the Solar Spectrum,” PASP 42, 209-13 (1930).
Babcock, Harold D., “The Construction and Characteristics of Some Diffraction Gratings,” PASP 45, 283-88 (1933).
Babcock, Harold D., “Wave Numbers of Infrared Spectral Lines Beyond λ10,000,”Phys. Rev. 46, 382-83 (1934)
Moore, Charlotte E. & Harold D. Babcock, “The Presence of Sulphur in the Sun,” Ap.J. 79, 492-97 (1934).
Russell, Henry Norris, Harold D. Babcock, & Charlotte E. Moore, “Series Lines of Magnesium in the Solar Spectrum,” Phys. Rev. 46, 826-27 (1934).
Babcock, Harold D., Charlotte E. Moore, & Wendell P. Hoge, “A Scale of Wave-Lengths in the Infra-Red Solar Spectrum,” Ap.J. 83, 103-20 (1936).
Babcock, Harold D., “Chemical Compounds in the Sun.,” Ap J. 102, 154-67 (1945).
Babcock, Harold Delos & Charlotte E. Moore, “The Solar Spectrum λ2914–λ3060,” Astronomical Journal 52, 41 (1946).
Babcock, Harold D., Charlotte E. Moore, & Mary F. Coffeen, “The Ultraviolet Solar Spectrum, λλ2935 to 3060,” Ap.J. 107, 287-302A (1948) [Errata].
Babcock, Harold D., “The Derivation of Vacuum Wave Numbers and the Reduction of Measured Wave Lengths to Standard Atmospheric Conditions.,” Ap.J. 111, 60-64 (1950).
Babcock, Harold D. & Horace W. Babcock, “The Ruling of Diffraction Gratings at the Mount Wilson Observatory,” Astronomical Journal 56, 120 (1951).
Babcock, Horace W. & Harold D. Babcock, “Mapping the Magnetic Fields of the Sun,” PASP 64, 282-87 (1952).
Babcock, Horace W. & Harold D. Babcock, “The Sun’s Magnetic Field, 1952-1954,” Ap.J. 121, 349-66 (1955).
Simpson, J.A., H.W. Babcock, & H.D. Babcock, “Association of a ‘Unipolar’ Magnetic Region on the Sun with Changes of Primary Cosmic-Ray Intensity, ” Phys. Rev. 98, 1402-06 (1955).Babcock, H.W., B.H. Rule, & J.S. Fassero, “An Improved Automatic Guider,” PASP 68, 256 (1956).
Babcock, H.W. & H.D. Babcock, “Photospheric Magnetic Fields,” in Electromagnetic Phenomena in Cosmical Physics, Proceedings from IAU Symposium no. 6. Edited by B. Lehnert. International Astronomical Union. Symposium no. 6, (Cambridge University Press, 1958), p.239-47.Babcock, Harold D., “The Sun’s Polar Magnetic Field,” Ap.J. 130, 364-65 (1959).
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Babcock, Harold D., “Astronomy without a Telescope,” Popular Astronomy 43, 81-92 (1935).
Babcock, Harold D., “What’s in the Air?” Astronomical Society of the Pacific Leaflets 6, 322-29 (1953) [Leaflet #291, the address given on receipt of the Bruce Medal].
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