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  1. 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
  2. By: Spencer, Guilford L. (Guilford Lawson),
    Publication info: Washington,Govt. print. off.,1894
    Holding Institution: University of California Libraries (archive.org)
  3. By: Wiley, Harvey Washington, - Spencer, Guilford L. (Guilford Lawson), - Denton, Albert Augustus. - Thompson, Wibray J.
    Publication info: Washington,Govt. Print. Off.,1892.
    Holding Institution: University of California Libraries (archive.org)
  4. By: Spencer, Guilford L. (Guilford Lawson),
    Publication info: Washington,Govt. Print. Off.,1887.
    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)