Natural and cultural history of the Mines of Spain, Dubuque County, Iowa - Prior, Jean Cutler.; Iowa Natural History Association.; Geological Society of Iowa. (Geological Society of Iowa, 1991)
"April 20, 1991."
Includes bibliographical references.
Keywords: Natural history / Iowa / Dubuque County / Guidebooks.; Mines and mineral resources / Iowa / Dubuque County / Guidebooks.; Dubuque County (Iowa) / History.; Mines of Spain State Recreation Area (Iowa) / Guidebooks.