"How the Worlds Were Made,", undated Request Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series IV: Writings of Harold Jacoby, approximately 1908-1911, undated
"Is Mars Inhabited" Request Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series IV: Writings of Harold Jacoby, approximately 1908-1911, undatedApproximately, 1909-1910
J Request Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series II: Correspondence of Harold Jacoby, 1888-1913Subseries II.2: Jacoby's Letter File, approximately, 1888-1891
K-L Request Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series II: Correspondence of Harold Jacoby, 1888-1913Subseries II.2: Jacoby's Letter File, approximately, 1888-1891
"Lick Eros Plates,", 1900-1901 Request Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series V: Observatory Ledgers and Astronomical Reports, 1896-1917
"Lick Eros Plates,", 1900-1901 Request Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series V: Observatory Ledgers and Astronomical Reports, 1896-1917
"Lick Eros Plates,", 1901 Request Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series V: Observatory Ledgers and Astronomical Reports, 1896-1917
"Lick Eros Plates,", 1901 Request Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series V: Observatory Ledgers and Astronomical Reports, 1896-1917
"Lick Eros Plates," 1901, undated, 1901, undated Request Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series V: Observatory Ledgers and Astronomical Reports, 1896-1917
"Lick Eros Plates,", 1902-1903 Request Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series V: Observatory Ledgers and Astronomical Reports, 1896-1917