60" telescope logbooks 1909-1935
1909 July 12-1913 December 31
1914 January 1-1915 December 31
1916 January 1- 1917 December 31
1918 January 1-1919 December 31
1920 January 1-1923 December 31
1924 January 1-1935 June 30
100" telescope logbooks 1916-1975
1916 January 1-1922 June 17
1922 July 1-1930 December 31
1931 January 1-1941 December 31
1942 January 1-1953 June 30
1953 July 1-1964 June 30
1964 July 12-1975 November 30