1901 Box 2, Folder 6 to 9 Columbia University Archives Department of Astronomy records, 1880-1917Series I: Correspondence of John K. Rees, 1880-1902
1902 Box 2, Folder 10 to 13 Columbia University Archives Department of Astronomy records, 1880-1917Series I: Correspondence of John K. Rees, 1880-1902
1903 Box 5, Folder 4 Columbia University Archives Department of Astronomy records, 1880-1917Series V: Observatory Ledgers and Astronomical Reports, 1896-1917
1907 October-1908 June Box 3, Folder 1 Columbia University Archives Department of Astronomy records, 1880-1917Series II: Correspondence of Harold Jacoby, 1888-1913Subseries II.1: General, 1907-1913
1908-1910 Regarding Visitors to the Observatory, 1908-1910 Box 3, Folder 8 Columbia University Archives Department of Astronomy records, 1880-1917Series II: Correspondence of Harold Jacoby, 1888-1913Subseries II.1: General, 1907-1913
1908-1911 With Carl Zeiss, 1908-1911 Box 3, Folder 9 Columbia University Archives Department of Astronomy records, 1880-1917Series II: Correspondence of Harold Jacoby, 1888-1913Subseries II.1: General, 1907-1913
1908 August-October Regarding Meeting at Put-in-Bay, 1908 August-October Box 3, Folder 2 Columbia University Archives Department of Astronomy records, 1880-1917Series II: Correspondence of Harold Jacoby, 1888-1913Subseries II.1: General, 1907-1913
1908 December Box 3, Folder 7 Columbia University Archives Department of Astronomy records, 1880-1917Series II: Correspondence of Harold Jacoby, 1888-1913Subseries II.1: General, 1907-1913
1908 November 1-12 Box 3, Folder 5 Columbia University Archives Department of Astronomy records, 1880-1917Series II: Correspondence of Harold Jacoby, 1888-1913Subseries II.1: General, 1907-1913
1908 November 13-30 Box 3, Folder 6 Columbia University Archives Department of Astronomy records, 1880-1917Series II: Correspondence of Harold Jacoby, 1888-1913Subseries II.1: General, 1907-1913