Non Print Resources:
Museum of Modern Art Archive: Visit in person or check out their digital repository of archival images.
LIFE Magazine Collection: Google Arts and Culture: This iconic midcentury magazine was based in New York. Find thousands of photos by famed photographers like Margaret Bourke-White, Gordon Parks.
This 5th Avenue museum preserves the history and culture of the people of New York City. They have a great online collection of artwork, photos, ads, and objects.
The National Archives has an amazing array of records--from genealogical research to government documents to city planning. Definitely worth checking out.
Non-Print Resources:
New York Times Archive: TimesMachine (make an account by going to nyt.com/passes first!)
Non-Print Resources: