1. Vital Records of specific Connecticut Towns
2. Connecticut surnames vital records - General Index

The original manuscript is at the Connecticut State Library in Hartford:

The collection covers 137 towns and comprises 14,333 typed pages of birth, marriage, and death records to about 1850 and was the work of General Lucius Barnes Barbour. As Connecticut Examiner of Public Records from 1911 to 1934, he "directed a project in which the vital records kept by the towns up to about 1850 were copied and abstracted." The collection was microfilmed in 1949 by the LDS in SLC and is available by loan through FHCs across the country:

Several libraries, genealogy centers, universities, etc... across the country have the Barbour Collection usually in microfilm form like the Sutro Library in San Francisco; Western Reserve in Cleveland, OH; Ft. Wayne, IN; NEHGS in Boston; NSDAR library in D.C.; most towns in CT have their collection either in their town clerk offices, local libraries and/or genealogy/history societies; State of CT Library; etc...

Lorraine Cook White compiled/transcribed some of the Barbour Collection into individual books/volumes which, if still available, are for sale through some genealogy book publishers

Not all towns were covered by the Barbour Collection town vital records. Examples are Scotland and Mansfield. However, I have found that the General Index format of the Barbour Collection contains the VRs of people living in Mansfield with Dimocks' Births, Baptisms, Marriages and Deaths of Mansfield, Conn. used as source.

Here are websites with listings of  on-line transcriptions of Barbour Collections: