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- Contributions to stratigraphy
- Geological Survey bulletin
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- U.S. Geological Survey professional paper
- Unconformities, correlation and nomenclature of some Triassic and Jurassic rocks, western interior United States
- Unconformities, correlation, and nomenclature of some Triassic and Jurassic rocks, western interior United States
- Unconformities, correlationand nomenclature of some Triassic and Jurassic rocks, western interior United States
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