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Midwest gem, fossil and mineral trails: Great Lakes states

GBK Zeitner, June Culp MWST Midwest gem, fossil and mineral trails: Great Lakes states. Gem Guides,
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Midwest gem, fossil and mineral trails: Prairie States

GBK Zeitner, June Culp MWST Midwest gem, fossil and mineral trails: Prairie States. Gem Guides, 1998.
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Geologic time

GEO Newman, William L. HIST Geologic time. USGS.
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Atlas of the prehistoric world. Discovery

GEO Palmer, Douglas HIST Atlas of the prehistoric world. Discovery, 1999
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