Thank you for your interest in our rare maps. Please fill out this form to be added to the waitlist for the map 1870 Knapp Map of Northern Manhattan ( New York City ): Harlem, Washington Heights, Inwood . We encourage telling us about your interest in this specific map, and your collecting interests in general. This information will help direct our searches, and where a map is unobtainable, enable us to recommend a comparable alternative. Please note, there are several fields, including address and telephone, which are required to let us know your interest is serious.