Barbour presented the "Arnold" transcripts to the Connecticut State Library, where the information was typed onto printed forms. These form sheets were then cut, producing 12 small slips from each sheet. The slips for most towns were then alphabetized and the information was typed a second time on large sheets of rag paper, which were bound into a separate volume for each town. The slips for all towns were then interfiled, forming a statewide alphabetized slip index/abstract of most surviving town vital records to ca. 1850. Thus, there are two parts of the Barbour Collection: the slip index, and bound volumes for individual towns.

Statewide Slip Index/Abstract
The statewide alphabetical file, consisting of more than a million slips in index drawers, is arranged alphabetically by name of individual and within that, chronologically. Each slip contains a complete abstract of an event, generally a birth, marriage, or death. Where parentage, residence, or relationship is found in the original entry, it is included in the Barbour abstract.
At the bottom of each slip there is a citation to the original source from which the information was obtained: town, volume, and page. A list of abbreviations used may be found at in the front of each Barbour Collection bound volume. Although there is normally no more information in the original records than what appears in the abstract on the slip, researchers desiring to see the original context or verify the accuracy of the transcription may consult the original records on microfilms which are available for use at the Connecticut State Library or through LDS Family History Centers.
Extracted from the CT State Library

AVON

•  Barbour Collection of Vital Records

BERLIN

• Berlin Marriages to 1800

BLOOMFIELD

• Unavailable

BRISTOL

• Barbour Collection of Vital Records: (A-B) | (C-G) | (H-L) | (M-P) | (R-Y)
• Bristol Marriages to 1800

BURLINGTON

• Barbour Collection of Vital Records  (A-H)

CANTON

• Unavailable

EAST GRANBY

• Unavailable

EAST HARTFORD

• Early CT Marriages prior to 1800

EAST WINDSOR

• East Windsor Early CT Marriages

ENFIELD

• Unavailable

FARMINGTON

• Unavailable

GLASTONBURY

• Unavailable

GRANBY

• Barbour Collection of Vital Records (A-F) (G-O) (P-Y)

HARTFORD

• Barbour Collection of Vital Records (A-Z)

HARTLAND

• Hartland marriages to 1800

MANCHESTER

• Unavailable

MARLBOROUGH

• Unavailable

NEW BRITAIN

• Unavailable

NEWINGTON

• Unavailable

PLAINVILLE

• Unavailable

ROCKY HILL

• Unavailable

SIMSBURY

• Unavailable

SOUTH WINDSOR

• Unavailable

SOUTHINGTON

• Unavailable

SUFFIELD

• Unavailable

WEST HARTFORD

• Unavailable

WETHERSFIELD

• Unavailable

WINDSOR

• Unavailable

WINDSOR LOCKS

• Unavailable