by Indiana University. Extension Division

1920

by Michigan State University. Agricultural Experiment Station

1922

by Michigan State University. Agricultural Experiment Station

1928

by Michigan State University. Agricultural Experiment Station

1926

by University of Michigan. Office of Research Administration

1923

by University of Washington

1914

by University of Michigan

1925

by University of Michigan

1925

by University of Michigan

1925

by Washington State University

1923

by University of Michigan. School of Education

1930

by University of Michigan. School of Education

1929