1924-1929 - PhotosNLB
1924.001 (Copyrighted by others) U.S. Government zoologist nets cave swallows at the natural entrance to the Bat Cave, soon to be Carlsbad Cavern. Carlsbad Caverns National Park Collection

1924.001 (Copyrighted by others) U.S. Government zoologist nets cave swallows at the natural entrance to the Bat Cave, soon to be Carlsbad Cavern. Carlsbad Caverns National Park Collection

1924.001