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The 2020 NSS Convention Geology Field Trip, North Fork of the South Branch of the Potomac River, by George Dasher; 84 pages, 66 photos, ten maps, 21 geological schematics; color; describes a geology field trip from Elkins to Germany Valley, with the primary stops at Bowden, Smoke Hole Caverns, Hellhole, and Seneca Caverns. Color.
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 "The 2020 NSS Convention Geology Field Trip, North Fork of the South Branch of the Potomac River")
