On 26 Apr 1739 when Mary was 24, she married Joseph Hapgood (22503) , son of Thomas Hapgood (13953) (1 Oct 1669-4 Oct 1764) & Judith Barker (8418) (9 Apr 1671-15 Aug 1759), in Concord, MA.77 Born on 2 Oct 1714.371

From the Concord vital records:371
    Joseph Hapgood of Marlborough and Mary Brooks of Concord Were married by Justice Minott May. 30: 1739.