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Authors whose works are in public domain in at least one jurisdiction

List of works by Claude Ervin Needham

Correlation of Pennsylvanian Rocks of New Mexico

article by Claude Ervin Needham published 1940 in AAPG Bulletin

Standard Permian Section of North America

article by John Emery Adams et al published 1939 in AAPG Bulletin

The Pennsylvania-Permian Contact in New Mexico: ABSTRACT

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