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Bulletin of the Geological Society of America

GSA Bulletin June 01, 1938, Vol.49, 831-930. doi:https://doi.org/10.1130/GSAB-49-831
GSA Bulletin June 01, 1938, Vol.49, 931-956. doi:https://doi.org/10.1130/GSAB-49-931
GSA Bulletin June 01, 1938, Vol.49, 957-980. doi:https://doi.org/10.1130/GSAB-49-957
GSA Bulletin June 01, 1938, Vol.49, 981-988. doi:https://doi.org/10.1130/GSAB-49-981
GSA Bulletin June 01, 1938, Vol.49, 989-996. doi:https://doi.org/10.1130/GSAB-49-989
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