“A Discussion of the Deflection of Beams in Trestles and Common Wooden Bridges” by Dr. Albert E. Maltby from Cornell University, 1876, Box: 1, Folder: 8. Albert E. Maltby Collection, 3-2. Slippery Rock University Archives and Special Collections. http://as-slippery.klnpa.org/repositories/2/archival_objects/12615 Accessed May 23, 2026.