Kardell, Caroline Lewis, and Lovell, Russell A. Jr., Vital Records of Sandwich Massachusetts to 1885, Vols. 1 and 2, Boston, New England Historic Genealogical Society, 1996.
Both volumes available online as:
New England Historic Genealogical Society, Massachusetts Vital Records to 1850, Online Database, AmericanAncestors.org, 2001-2010.