These resources contain early Connecticut birth, death, and marriage records:
Early Connecticut Marriages as Found on Ancient Church Records Prior to 1800, Seventh Book (Read)
Births, Marriages, Baptisms and Deaths in Coventry, Connecticut, 1711-1844, by Susan Whitney Dimock, 1897 (Read)
Births, Baptisms, Marriages and Deaths in Mansfield, Connecticut 1703-1850 by Susan Whitney, Dimock, 1898 (Read)