MapHydrologic unit map--1988, states of Massachusetts, Rhode Island, and Connecticut Shows hydrologic units and codes, planning districts, and watersheds. Relief shown by spot heights. Base map: Mass.-R.I.-Conn., base map. Drainage modified 1988. Edition of 1948. Base map title in right upper margin:...
- Contributor: Geological Survey (U.S.) - Water Resources Council (U.S.)
- Date: 1988