• Much of the “Collection Scope and Content” and “Provenance” are condensed from W. Wilson Hulme II’s notes on the subject.
  • Thomas J. Alexander, George W. Brett, and W. Wilson Hulme II, compilers, United States Postal History and Postage Stamps Official Records (Cary, IL: James E. Lee, 2011).
  • Joseph A. Steinmetz, A Hundred or So Graphic Pages Selected at Random from a Wonderland Collection…, (New York, 1913).