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  1. By: May, David William,
    Publication info: Mayagüez, P.R, Porto Rico Agricultural Experiment Station, 1922
    Holding Institution: University of Florida, George A. Smathers Libraries
    BHL Collections: Expanding Access to Biodiversity Literature
  2. By: May, David William,
    Publication info: Porto Rico Agricultural Experiment Station, 1922
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Loew, Oscar, - May, David William, - United States. Bureau of Plant Industry.
    Publication info: Washington, U.S. G.P.O, 1901
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: May, David William,
    Publication info: Porto Rico Agricultural Experiment Station, 1910
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library