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  1. By: Ewell, Ervin Edgar, - Bigelow, Willard Dell, - Page, Logan Waller,
    Publication info: Washington,Govt. print. off.,1901.
    Holding Institution: University of California Libraries (archive.org)
  2. By: Ewell, Ervin Edgar,
    Publication info: Washington,Govt. print. off.,1898.
    Holding Institution: Library of Congress
  3. By: Spencer, Guilford L. (Guilford Lawson), - Ewell, Ervin Edgar, - United States. Division of Chemistry.
    Publication info: Washington, D.C. :G.P.O.,1892.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Ewell, Ervin Edgar,
    Publication info: Washington,Govt. print. off.,1903
    Holding Institution: University of California Libraries (archive.org)
  5. By: Spencer, Guilford L. (Guilford Lawson), - Ewell, Ervin Edgar,
    Publication info: Washington,Govt. print. off.,1892.
    Holding Institution: University of California Libraries (archive.org)