Family letters 1879-1906
New York State Coast and Geodetic Survey 1880, 1939
Professional correspondence 1896-1904
Professional correspondence 1905-1911
Writings and research files 1879-1912
Manuscripts 1893-1900
Personal notes 1894-1900
"Meridian Circle Observations made at Lick Observatory" 1896-1901
"Meridian Circle Observations of Reference Stars for the Planet Eros, at Opposition" 1900
"Plan for Division Error Determinations" circa 1900
"The San Luis Observatory of the Carnegie Institution," Publications of the Astronomical Society of the Pacific 1912
"The Star Lists of 99 Stars Between -10 and +15 Declination" undated
San Luis, Argentina Expedition 1908-1911
Steamship trip to San Luis 1908
Construction at San Luis 1908, 1910
Finances 1908-1909
Astronomical observations and calculations 1908-1910
Correspondence 1909-1911
Social events 1909-1911
Photographs 1884-1926