by Federal Experiment Station in Puerto Rico

1930

by Puerto Rico Experiment Station

1936

by Puerto Rico. Department of Education

1910

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

1930

by Puerto Rico. Agricultural Experiment Station, Mayaguez

1903

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

1911

by Puerto Rico

1911

by Puerto Rico. Governor

1922

by Puerto Rico. Governor

1912

by Puerto Rico. Governor

1919

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

1920

by Puerto Rico. Secretary's Office

1926