"A Lecture on the Method of Least Squares Applied to Conditioned Observations,", undated Box 4, Folder 19 Columbia University Archives Department of Astronomy records, 1880-1917Series IV: Writings of Harold Jacoby, approximately 1908-1911, undated
"American Astronomers to the Fore" Box 4, Folder 10 Columbia University Archives Department of Astronomy records, 1880-1917Series IV: Writings of Harold Jacoby, approximately 1908-1911, undatedApproximately, 1908
"Announcement to Precede Calendar Lecture,", November 24, 1908 Box 4, Folder 12 Columbia University Archives Department of Astronomy records, 1880-1917Series IV: Writings of Harold Jacoby, approximately 1908-1911, undated
Approximately, 1908 Columbia University Archives Department of Astronomy records, 1880-1917Series IV: Writings of Harold Jacoby, approximately 1908-1911, undated
Approximately, 1908 Columbia University Archives Department of Astronomy records, 1880-1917Series IV: Writings of Harold Jacoby, approximately 1908-1911, undated
Approximately, 1909 Columbia University Archives Department of Astronomy records, 1880-1917Series IV: Writings of Harold Jacoby, approximately 1908-1911, undated
Approximately, 1909-1910 Columbia University Archives Department of Astronomy records, 1880-1917Series IV: Writings of Harold Jacoby, approximately 1908-1911, undated
"A Short Course in Astronomy,", undated Box 4, Folder 19 Columbia University Archives Department of Astronomy records, 1880-1917Series IV: Writings of Harold Jacoby, approximately 1908-1911, undated
"Astronomical Research" Box 4, Folder 10 Columbia University Archives Department of Astronomy records, 1880-1917Series IV: Writings of Harold Jacoby, approximately 1908-1911, undatedApproximately, 1908
"Astronomical Research,", undated Box 4, Folder 17 Columbia University Archives Department of Astronomy records, 1880-1917Series IV: Writings of Harold Jacoby, approximately 1908-1911, undated