Has New Haven Colony and Town Records. Has all Yale dissertations ever published about New Haven. Strongest on materials pertaining to Yale. Materials do not circulate. The best place for maps in town, from 1700s on Map Collection Strongest on 1850-1920 and 1950 to present.
Most maps are very large.
Materials do not circulate. Has New Haven Colony and Town records, Dana collection, housing archives, Lee collection on microfilm, collections of various New Haven personages and organizations throughout the ages. Very supportive and knowledgeable staff. A catalog of the manuscript collections is available at the Society as well as at Yale and New Haven libraries. Collection is non-circulating.