Concepcion Fill / P.R.R. [Pacific Railroad?]: a man sitting by drainage in a tunnel, Box: 1, Folder: 15. John S. and Dan Dillon Casement papers and photographs, RH MS 755. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/28072 Accessed December 21, 2024.