PPast Speaks to YouPast Speaks to Youde Christopher J. SchuberthEdiciones (1)Past Speaks to You (1979)Illinois State Museum · inglés · ISBN 9780897920780Más obras de Christopher J. SchuberthA Combined East African geologic and wildlife safariFluorspar mining district, Cave-in-Rock and Shawnee National Forest, May 17-19, 1985TThe Geology of New York CityThe Geology of New York City
FFluorspar mining district, Cave-in-Rock and Shawnee NationalFluorspar mining district, Cave-in-Rock and Shawnee National Forest (Guidebooklet - Illinois State Museum)
