Guides to Historical Records
Guides to the New York State Archives and Statewide Repositories
Historic Documents Inventory (HDI)
The HDI Guides are guides to historical records organized by county. The contact information and summary collection descriptions for the 1200+ New York repositories in these guides were compiled in a survey initiated by the New York Historical Resources Center at Cornell University in 1978. You can order paper copies of the guides or search the HDI records through Excelsior, our online catalog. Holdings for Nassau County and new and updated records are only available online.