Lake Superior Rocks and Minerals Field GuideDan R. Lynch, Bob Lynch · First published 2021Open the Tome
Washington Oregon Rocks Minerals A Field Guide To The Evergreen And Beaver StatesBob Lynch · First published 2012Open the Tome
Agates Of Lake Superior Stunning Varieties And How They Are FormedBob Lynch · First published 2011Open the Tome
Minnesota Rocks Minerals A Field Guide To The Land Of 10000 LakesBob Lynch · First published 2011Open the Tome
Lake Superior Rocks Minerals A Field Guide To The Lake Superior AreaBob Lynch · First published 2008Open the Tome
