Page "7Henderson was one of the first to explore the Arapaho glacier, of which he took many photographs from 1902 to 1922. Photographs taken by him of glaciers can also be viewed online.“In the early 20th century,” according to one source, “the biology program of the University of Colorado, led by Dr. Junius Henderson and Dr. Gordon Alexander, made significant contributions to early [lists of birds" not found :(