TY  - BOOK
AU  - Jackson,Donald Dale
TI  - Underground worlds
AV  - GV200.62 J324U
PY  - 1982///
CY  - Alexandria, Va.
PB  - Time-Life Books
KW  - CAVING
KW  - HISTORY
KW  - 19TH CENTURY
KW  - 20TH CENTURY
KW  - CAVES
ER  -