Patricia D. Klingenstein Library at New-York Historical Society is open Tuesday through Saturday. All Klingenstein Library patrons must register before conducting research and will be asked to provide current government-issued photo identification. All researchers must register and create an account using their online collections request system.
Othmer Library at Brooklyn Historical Society is open Wednesdays through Saturdays. Researchers do not need an appointment to use books, periodicals, newspapers, maps and atlases, and the searchable database of digitized images and oral histories, but an appointments are required for using archival materials.