The map collection ranges from the 17th century to the present and includes both printed and manuscript items. Geographic scope varies by time period, but extends from New York to the entire country. Among the manuscript maps are the unique sketches of projected battle sites of the American Revolution by Robert Erskine and Simeon DeWitt. Later surveys include regional travel and tourist guides, and a series documenting overcrowding in Manhattan in the 1890s. Search BobCat to discover maps in the collection.