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

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.
The Francis M. and Henry H. Stone Collection contain twenty-one letters written by the two brothers while they were in the 27th Regiment of the New York Volunteer Infantry and the 1st Regiment New York Veteran Cavalry
The Maurice Leyden Collection consists of diaries, photographs, correspondence, financial records, essays and military records of Maurice Leyden. The collection also includes twenty-two diaries, dating from 1860-1886 and written Sarah Woodruff Pottle, a relative of Mr. Leyden, as well as, four diaries spanning the years between 1897 and 1908 and belonging to Blanche Leyden, Maurice Leyden's daughter.
Scenic postcards highlighting communities of Mastic, Mastic Beach and Shirley.
Historical pamphlets, newspaper clippings, and fliers detailing the early history of Long Island.

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