by University of Puerto Rico (Río Piedras Campus). Agricultural Experiment Station

1911

by University of Puerto Rico (Río Piedras Campus). Agricultural Experiment Station

1911

by Puerto Rico. Experiment Station, Río Piedras

1911

by Federal Experiment Station in Puerto Rico

1930

by Puerto Rico. Insular Experiment Station, Río Piedras

1903

by University of Puerto Rico (Río Piedras Campus). Agricultural Experiment Station

1920

by Puerto Rico. Dept. of the Interior

1927

by Puerto Rico. Governor

1919

by Puerto Rico. Department of the Interior

1917

by Puerto Rico Experiment Station

1936

by Puerto Rico. Department of Health

1926

by University of Puerto Rico (Mayagüez Campus). Agricultural Experiment Station

1912