* "England Births and Christenings, 1538-1975," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J7P3-GVZ : 30 December 2014), Giles Alderson in entry for Mark Alderson, 01 May 1766; citing Barton, York, England, reference item 15-16; FHL microfilm 1,849,267.
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