by Puerto Rico Agricultural Experiment Station

1915

by Puerto Rico. Agricultural Experiment Station, Mayaguez

1915

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

1911

by Puerto Rico. Dept. of Education

1900

by Puerto Rico. Department of Education

1917

by Puerto Rico. Secretary's

1901

by Puerto Rico. Experiment Station, Río Piedras

1911

by Puerto Rico. Federal Experiment Station, Mayaguez

1903

by Puerto Rico. Secretary's Office

1901

by Federal Experiment Station in Puerto Rico

1911

by Puerto Rico. Insular Experiment Station, Río Piedras

1903

by Puerto Rico. Mayaguez. Agricultural Experiment Station

1907