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"New Hampshire Birth Records, Early to 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FLG6-6RH : 23 February 2021), William Leach, 08 Apr 1790; citing Newbury, Merrimack, New Hampshire, United States, Bureau of Vital Records and Health Statistics, Concord; FHL microfilm 1,001,012.
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Find a Grave, database and images (https://www.findagrave.com : accessed 23 October 2020), memorial page for William Leach Jr. (unknown–4 Nov 1824), Find A Grave: Memorial #6865616, citing Baker Hill Cemetery, Newbury, Merrimack County, New Hampshire, USA.
Revolutionary War Pension Records Heritage Quest On-line database ->Search Revolutionary War. Heritage Quest at Ancestery.com On-line database.
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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.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with William: