Davidson, E. J., “History of the Discovery of the Marble Halls of
Oregon.” _Oregon Historical Quarterly_, Vol. 23, pp. 274-276
(1922).
Folsom, Franklin, _Exploring American Caves_. New York, Crown
Publishers, Inc., 1956.
Halliday, William R., _Adventure Is Underground_. New York, Harper and
Brothers, Publishers, 1959.
Mohr, Charles E., and Howard N. Sloane, _Celebrated American Caves_. New
Jersey, Rutgers University Press, 1955.
Wells, Francis G., Preliminary geological map of southwest Oregon.
U.S.G.S. Mineral Investigation Map, MF 38, 1955.
_RULES AND REGULATIONS_
(_Briefed_)
1. No person shall enter Oregon Caves unless accompanied by an
authorized guide.
2. Children under 6 years of age are not permitted in the caves. A
nursery is provided.
3. The destruction, injury, defacement or removal of any of the natural
features, rocks, plants, or animals in the caves or Monument is
prohibited.
4. No canes, umbrellas or sticks of any kind may be taken into the
caves.
5. Dogs and cats must be kept under physical control and are not allowed
on trails or in the buildings.
6. Careless disposal of trash is prohibited; please use the containers
placed nearby.
THIS IS _YOUR_ NATIONAL MONUMENT
Please help keep it clean and undamaged for those who follow you.