Frederick Hoffman
March 2, 1948: Monthly Meeting
Early Days of Skyscrapers in Color and Words
November 5, 1941: Monthly Meeting
Movie which Showed McMath-Hulbert Observatory
January 8, 1941: Monthly Meeting
Reminiscences of the Skyscrapers' Nine Years
October 23, 1940: Monthly Meeting
What, When and How to Observe During the Transit of Mercury of Nov. 11, 1940
June 1, 1936: Monthly Meeting
Motion Pictures of Skyscraper Past Activities
December 2, 1935: Monthly Meeting
David Dunlop Memorial Observatory
October 7, 1935: Monthly Meeting
