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  1. By: Van Volkenberg, H. L. (Horatio Luther),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, Office of Experiment Stations, [1939]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Van Volkenberg, H. L. (Horatio Luther),
    Publication info: Mayagüez, P.R, Puerto Rico Agricultural Experiment Station, 1934
    Holding Institution: University of Florida, George A. Smathers Libraries
    BHL Collections: Expanding Access to Biodiversity Literature
  3. By: Van Volkenberg, H. L. (Horatio Luther),
    Publication info: Puerto Rico Agricultural Experiment Station, 1934
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Van Volkenberg, H. L. (Horatio Luther),
    Publication info: Puerto Rico Agricultural Experiment Station, 1935
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    BHL Collections: Expanding Access to Biodiversity Literature
  5. By: Van Volkenberg, H. L. (Horatio Luther),
    Publication info: Mayagüez, P.R, Puerto Rico Agricultural Experiment Station, 1936
    Holding Institution: University of Florida, George A. Smathers Libraries
    BHL Collections: Expanding Access to Biodiversity Literature
  6. By: Van Volkenberg, H. L. (Horatio Luther),
    Publication info: Puerto Rico Agricultural Experiment Station, 1936
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library