https://www.loc.gov/pictures/resource/cph.3a03757/ also published in: Cavers, Caves & Caving, Rutgers University Press, (Bruce Sloane, editor)page 269, illustration...
English Map of Mammoth Cave, Kentucky - drawn by Stephen Bishop in 1842, published in 1845 in "Rambles in the Mammoth Cave, During the Year 1844"...
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