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15. Koshland, D. E., Jr. (1993). "Asteroid or Volcano: Have the Volcanists
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18. Ibid.
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C
HAPTER
7
1. Doyle, A. C. (1950).
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the Dinosaurs Didn't Have a Chance)."
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4. Koeberl, C, and R. R. Anderson (1996). Manson and Company: Impact
Structures in the United States.
The Manson Impact Structure, Iowa:
Anatomy of an Impact Crater,
eds. C. Koeberl and R. R. Anderson.
Boulder, Colo.: Geological Society of America. (Special Paper 302: 1-29)
5. Kunk, M. I, G. A. Izett, et al. (1989). "Ar-40/Ar-39 Dating of the Manson
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6. Izett, G. A., W. A. Cobban, et al. (1993). "The Manson Impact Structure:
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7. Ibid.
