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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Thomas, H. E. (Harold Edgar),
    Edition: 1st ed.
    Publication info: New York, McGraw-Hill, 1951
    Holding Institution: MBLWHOI Library
  2. By: Van Zwaluwenburg, R. H. (Reyer Herman), - Thomas, H. E. (Harold Edgar), - Puerto Rico Agricultural Experiment Station. - United States. Department of Agriculture. - United States. Department of Agriculture. States Relations Service.
    Publication info: Washington, G.P.O. under the supervision of States Relations Service, Office of Experiment Stations, U.S. Dept. of Agriculture, 1918
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library