Lake Superior Rocks & Minerals Field Guide , 2nd: Field Guide To Lake Superior AreaLynch, Dan R. & Bob Lynch $14.95
Rockhounding & Prospecting Upper Midwest: How To Find Gold, Copper, Agates, Thomsonite & Other FavoritesMagnuson, Jim $19.95
The Story Of Earth In 25 Rocks: Tales Of Important Geological Puzzles & The People Who Solved ThemProthero, Donald R. $24.00