Preliminary List of Minerals and Mineral Localities of Larimer County Colorado. R.G. Coffin and J. Harlan Johnson, Box: 7, Folder: 5. J. Harlan Johnson papers, RH MS 735. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/52828 Accessed January 13, 2025.