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Bulletin of the Geological Society of America

GSA Bulletin April 01, 1938, Vol.49, 525-538. doi:https://doi.org/10.1130/GSAB-49-525
GSA Bulletin April 01, 1938, Vol.49, 539-602. doi:https://doi.org/10.1130/GSAB-49-539
GSA Bulletin April 01, 1938, Vol.49, 603-614. doi:https://doi.org/10.1130/GSAB-49-603
GSA Bulletin April 01, 1938, Vol.49, 615-628. doi:https://doi.org/10.1130/GSAB-49-615
GSA Bulletin April 01, 1938, Vol.49, 629-652. doi:https://doi.org/10.1130/GSAB-49-629
GSA Bulletin April 01, 1938, Vol.49, 653-658. doi:https://doi.org/10.1130/GSAB-49-653
GSA Bulletin April 01, 1938, Vol.49, 659-668. doi:https://doi.org/10.1130/GSAB-49-659
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