This map is from the “pocket edition” of the New York Walk Book, published in 1923 by the American Geographical Society. The Croton area walks include:
- Salt Hill Route—Croton to Croton Lake Station
- Croton Lake Region—Harmon to Millwood
- Montrose to Harmon via Spitzenberg and Keg Mountains
In addition to the maps the book has detailed pen-and-ink drawings like the one below of the mouth of the Croton River.