- Troost, Gerard, 1776-1850
- Digital Commonwealth
- Boston Public Library
Shows main rivers and tributaries, towns and cities. Does not include reference for colors. From: Fifth report of Dr. G. Troost, State Geologist. By G. Troost ; P.S. Duval lith.
- No known copyright restrictions. This work is licensed for use under a Creative Commons Attribution Non-Commercial Share Alike License (CC BY-NC-SA).