Darwin R. Spearing (Spearing, Darwin R.)

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  Roadside Geology of Louisiana
  by Darwin R. Spearing
  Softcover, Lone Pine Publishing, ISBN 0878423249 (0-87842-324-9)
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  Roadside Geology of Texas
  by Darwin Spearing
  Softcover, Mountain Pr, ISBN 087842265X (0-87842-265-X)
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  Roadside Geology of Wyoming
  by Darwin R. Spearing, David Lageson
  Softcover, Mountain Pr, ISBN 0878422161 (0-87842-216-1)