Map of Azoic and Paleozoic Formations including the Iron-Ore and Limestone Districts, Map-0390, Object: 1. Special Collections and University Archives, Virginia Tech.
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Map of Azoic and Paleozoic Formations including the Iron-Ore and Limestone Districts, Map-0390, Object: 1. Special Collections and University Archives, Virginia Tech. https://aspace.lib.vt.edu/repositories/2/resources/749 Accessed April 26, 2024.
