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Correlation Charts Prepared by the Committee on Stratigraphy of the National Research Council (Bulletin of the Geological Society of America, Vol. 53, pp. 429-434, 1942.)Author name:
Carl O. Dunbar (Chairman),
G. Arthur Cooper,
Carey Croneis,
B.F. Howell,
Raymond C. Moore,
Jr. John B. Reeside,
Lloyd W. Stephenson,
Charles K. Swartz,
W.H. Twenhofel,
C.E. Weaver1953