Earth history field trip for high school science teachers

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110 2 ‡aIllinois State Geological Survey.
245 1 0 ‡aEarth history field trip for high school science teachers.
260 ‡a[Urbana, Ill.? : Illinois State Geological Survey, ‡c1947-49.
300 ‡a7v in 1 : ‡bill., fold. maps, tables ; ‡c28 cm.
520 ‡aItineraries for geological trips, and brief accounts of the geologic history of the areas concerned.
538 ‡aMode of access: Internet.
550 ‡a"Sponsored by the State Geological Survey."
650 0 ‡aGeology ‡zIllinois.
CID ‡a000862466
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