Rockhounding Deleware, Maryland, & Washington, D.C.
By: Beard, RobertPrice: $21.95
Falcon Guides (an imprint of Globe Pequot Press), 2015. This is one of the only collecting guides for this area of the country in print. It has GPS coordinates, color photos of localities and specimen of minerals, fossils, and lapidary materials. Also color maps. Paperback, 269 pages.