by Johns Hopkins University

1929

by University of Illinois (Urbana-Champaign campus). High School Visitor

1918

by Liverpool (England). University. Library, University of Liverpool. Library

1913

by Johns Hopkins University

1900

by Johns Hopkins University

1908

by Johns Hopkins University

1882

by Johns Hopkins University

1925

by Michigan State University

1912

by Ohio State University. College of Agriculture. Extension Service

1926

by University of Pennsylvania. Zoological Laboratory

1927

by University of Michigan

1912

by University of Chicago

1914