The Resistance of the Air Determined at Speeds Below One Thousand Feet a Second With Description of Two New Methods of Measuring Projectile Velocities Inside and Outside the Gun- by Albert F. Zahm, 1898, PAZA 1/08. Albert Francis Zahm Papers, AZA. University of Notre Dame Archives. https://archivesspace.library.nd.edu/repositories/2/archival_objects/1772906 Accessed November 25, 2024.