Items in New York Heritage are organized into collections, which provide additional context for understanding their significance and meaning.

The Long Island Historic Postcard Collection consists of postcards of towns and villages in Queens, Nassau, and Suffolk Counties of New York dating from the 19th and 20th centuries.
The Lewis H. Brown Collection consists of sixty-four letters written by Lewis Henry Brown, Lewis’ brother Burritt Brown, and Albert Ransom, Burritt Brown’s friend and tent-mate.