Genzel, Carolyn, George Verdelle Shannon, private email, 2/6/2003. Author address: cgenzel at 1starnet dot com Information from this source tagged as [Ref: Carolyn Genzel 2/6/2003].
Shannon, Dexal, SHANNON 1571-1990. unpublished notebook, dated Dec 1990. Available at https://familysearch.org/search/catalog/778102. Information from this source tagged as [Ref: ShannonD SHANNON p[0-9]*].