by University of North Carolina at Chapel Hill

1926

by California. University. Regents

1914

by University of Michigan. Board of Regents

1957

by Colorado. University

1892

by University of Arizona. Agricultural Experiment Station

1920

by University of Michigan. Board of Regents

1948

by Michigan State University. Library

1882

by Colorado. University

1911

by University of Colorado (Boulder campus)

1909

by University of Colorado (Boulder campus)

1913

by University of Colorado (Boulder campus)

1912

by University of Colorado

1919