by National University Extension Association

1923

by University of Chicago

1896

by University of Chicago

1894

by University of Chicago

1893

by Johns Hopkins University

1902

by Johns Hopkins University

1892

by Stanford University

1910

by University of Southern California

1914

by University of Nebraska (Lincoln campus)

1923

by National University Extension Association. Committee on Standardization

1924

by Johns Hopkins University

1899

by Johns Hopkins University

1901