by Imperial Department of Agriculture for the West Indies

1908

by Imperial College of Tropical Agriculture (Trinidad and Tobago)

1929

by Imperial College of Tropical Agriculture (Trinidad and Tobago) Department of Mycology and Bacteriology

1930

by Imperial Institute (Great Britain)

1911

by Imperial Department of Agriculture for the West Indies

1910

by Great Britain. Imperial Dept. of Agriculture for the West Indies

1900

by Imperial Institute (Great Britain)

1909

by Great Britain. Imperial Department of Agriculture for the West Indies

1901