Manuscripts
O -- Miscellaneous
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O -- Miscellaneous
Manuscripts
Brian O'Brien (2); Optical Society of America [some re R. R. McMath] (6)
mssPettit papers
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O -- Miscellaneous
Manuscripts
Optical Society of America (14); Bernard Levussove Oser [Food Research Laboratories, Inc.] (3)
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O -- Miscellaneous
Manuscripts
Optical Society of America (10); Oregon Tuberculosis Association (1); F. H. Osler (2)
mssPettit papers
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A -- Miscellaneous
Manuscripts
Giorgio Abetti (5); Adler Planetarium (3); Aircraft Radio Laboratory, War Department (2); Allegheny Ludlum Steel Corp. (5); American Association of Scientific Workers (2); American Astronomical Society [Joel Stebbins] (1); "American Defense" [California Institute, Huntington Library, Mount Wilson Observatory Group] (1); American Geophysical Union [Charles Franklin Brooks, letter re C. G. Abbot's proposal --includes carbons of letters from: Helmut Landsberg, Larry F. Page, Harlan True Stetson, Homer Woodworth Clough, & Chaim Leib Pekeris] (10); American Peoples Encyclopedia (11); Clifford Norman Anderson [includes typed manuscript "A Representation of the Sunspot Cycle", copy letter from John Adam Fleming, & copy typed ms. "Solar Radiation and Geomagnetism," by J. Bartels] (6); L. E. Armfield (2); Betty June Arnold (2); Astronomical Society of the Pacific (2); L. d'Azambuja (1)
mssPettit papers
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O -- Miscellaneous
Manuscripts
Office of Scientific Resarch and Development [Mina Rees] (1); Optical Society of America (1); Maury Osborne (2); S. L. Osborne (2)
mssPettit papers
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P -- Miscellaneous
Manuscripts
John S. Paraskevopoulos (1); John A. Parkhurst [includes typed manuscript "The Total Radiation of Variable Stars Observed with the Vacuum Thermocouple at Mount Wilson"] (3); William Henry Pickering (1); Popular Astronomy (2)
mssPettit papers