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

1924

by University of Puerto Rico (Río Piedras Campus)

1924

by Puerto Rico. Insular Experiment Station, Río Piedras

1903

by Puerto Rico. Federal experiment station, Mayaguez

1918

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

1920

by Puerto Rico Experiment Station

1936

by Federal Experiment Station in Puerto Rico

1912

by Puerto Rico. Office of the Attorney General

1916

by Puerto Rico. Department of Justice

1916

by Puerto Rico. Office of the Attorney General

1915