"New Jersey Births and Christenings, 1660-1980," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FZCC-W5V : 12 December 2014), John Cook in entry for Etta Cook, 25 Jun 1887; citing Peq , Morris, New Jersey, reference ; FHL microfilm 494,209.
United States Census, 1870, West Milford, Passaic, New Jersey. John J. Cook, age 33; Mary A. Cook, age 23 (Birth Place: Bavaria); Joseph H. Cook, age 11; Matilda F. Cook, age 8; Mary C. Cook, age 5; William J. Cook, age 2. [1]
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