First edition published: Black Earth, Wisconsin : Trails Books, 2003. Includes bibliographical references (page 189). Includes bibliographical references (page 189).
Summary:
"Explore more than 50 of Minnesota's and South Dakota's fascinating caves, mines, sinks and underground oddities. Spelunkers and explorers alike will enjoy this edition"-- Provided by publisher.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.