Rockhounding and Prospecting: Upper Midwest, How to Find Gold, Copper, Agates, Thomsonite and Other Favorites, AdventureKEEN, Adventure with Keen,Geology, geomorphology and the lithosphere,Earth sciences, ,, , United States, en-UShttps://adventurewithkeen.com, [BLURB],[CITY],,books, ebooks, biblet, Book2look