TY  - BOOK
AU  - Jackson,Donald Dale
ED  - Time-Life Books
TI  - Underground worlds
T2  - Planet earth : 6
SN  - 0809443201
AV  - GB601.3 J12 U5 1982
PY  - 1982///
CY  - Alexandria, Va.
PB  - Time-Life Books
KW  - Caving
KW  - History
KW  - 19th century
KW  - 20th century
KW  - Caves
ER  -