Map of Cretaceous Formations including the Green-Sand Marl Beds, Map-0396, Object: 1. Special Collections and University Archives, Virginia Tech.
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Map of Cretaceous Formations including the Green-Sand Marl Beds, Map-0396, Object: 1. Special Collections and University Archives, Virginia Tech. https://aspace.lib.vt.edu/repositories/2/resources/755 Accessed April 26, 2024.
