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  1. By: Loew, Oscar,
    Publication info: Washington :G.P.O.,1899.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. 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