History of Mammoth Cave, emphasizing tourist development and medical experimentation under Dr. John Croghan.
Thomas
S W
SW
Conner
E H
EH
Meloy
H A
HA
D004470:Economics, Medical / Q000266:history*; D005101:Expeditions / Q000266:history*; D049711:History, Modern 1601-; D014195:Travel / Q000266:history*; D014481:United States