SUGGESTED READING
Reading edition
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.
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