• Miscellaneous photographs 

        Contributor:Unknown
        Date:1900-1901
        Images of John Henry Nelson, a note, a house, the Colorado Plains Substation in 1900, a ship, a masonry dam in Holyoke, Massachusetts, and euchlaena luxurians teosinte in 1901
      • Canal lining manual 

        Contributor:Unknown
        Date:1946
        All images are reproduced in the Colorado Agricultural Experiment Station publication, Canal Lining Manual, by Carl Rohwer, 1946