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Bulletin of the Geological Society of America

GSA Bulletin February 01, 1938, Vol.49, 151-194. doi:https://doi.org/10.1130/GSAB-49-151
GSA Bulletin February 01, 1938, Vol.49, 195-248. doi:https://doi.org/10.1130/GSAB-49-195
GSA Bulletin February 01, 1938, Vol.49, 249-288. doi:https://doi.org/10.1130/GSAB-49-249
GSA Bulletin February 01, 1938, Vol.49, 289-302. doi:https://doi.org/10.1130/GSAB-49-289
GSA Bulletin February 01, 1938, Vol.49, 303-342. doi:https://doi.org/10.1130/GSAB-49-303
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