Lee, Willis T.
New discoveries in Carlsbad Cavern
The national geographic magazine, vol. xlviii, n° 3 (1925) 301-320
A visit to Carsbad Cavern, New Mexico
The national geographic magazine, vol. xlv, no. 1 (1924) 1-32
New discoveries in Carlsbad Cavern
The national geographic magazine, vol. xlviii, n° 3 (1925) 301-320
A visit to Carsbad Cavern, New Mexico
The national geographic magazine, vol. xlv, no. 1 (1924) 1-32