"United States Social Security Death Index," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/J1VX-QNB : accessed 11 December 2014), William R Nickerson, 22 Nov 2000; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"Find A Grave Index," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/QVVH-QQRJ : accessed 11 December 2014), William Robert Nickerson, 2000; Burial, Wake Village, Bowie, Texas, United States of America, Chapelwood Memorial Gardens; citing record ID 7712043, Find a Grave, http://www.findagrave.com.
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DNA Connections
It may be possible to confirm family relationships with William by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: