by Yale University

1921

by Michigan State University. Agricultural Experiment Station

1886

by Johns Hopkins University

1886

by Northwestern University (Evanston, Ill.)

1882

by Northwestern University (Evanston, Ill.)

1900

by Johns Hopkins University

1891

by University of Iowa, State University of Iowa

1913

by Indiana University

1886

by Northwestern University (Evanston, Ill.)

1877

by Northwestern University (Evanston, Ill.)

1891

by University of Colorado

1905

by University of Cambridge

1908