"Pedigree Resource File," database, FamilySearch (https://familysearch.org/ark:/61903/2:2:3D4H-2MD : accessed 10 March 2019), entry for William /Dugger/, cites sources; "Mark's Tree" file (2:2:2:MMD1-T51), submitted 9 March 2017 by markr4681 [identity withheld for privacy].
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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 Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Dugger-481 and Dugger-680 appear to represent the same person because: 481"s birth date seems more accurate. I also have a 7cm match with a descendant of his father.