Pegmatite

Campbell, I., and Maxson, J.H., 1937, Geological studies of the Archean rocks at Grand Canyon: Carnegie Institution of Washington Year Book 36, p. 345-346.

Campbell, I., and Maxson, J.H., 1936, Geological studies of the Archean rocks at Grand Canyon: Carnegie Institution of Washington Year Book 35, p. 329-331.

Campbell, I., and Maxson, J.H., 1935, Geological studies of the Archean rocks at Grand Canyon: Carnegie Institution of Washington Year Book 34, p. 323-326.

Campbell, I., and Maxson, J.H., 1934, Geological studies of the Archean rocks at Grand Canyon: Carnegie Institution of Washington Year Book 33, p. 284-285.

Campbell, I., and Maxson, J.H., 1933, Archean formations of the Grand Canyon [abs.]: Science, new series, v. 77, p. 460.

Campbell, I., and Maxson, J.H., 1933, Field studies of the Archean in Grand Canyon: Grand Canyon Nature Notes, v. 8, p. 141-151.

Campbell, I., and Maxson, J.H., 1933, Geological studies of the Archean rocks at Grand Canyon: Carnegie Institution of Washington Year Book 32, p. 305-306.

Campbell, I., 1937, Types of pegmatites in the Archean at Grand Canyon, Arizona [abs.]: Geological Society of America, Annual Meeting, 49th, 1936, Proceedings, p. 332.

Campbell, I., 1937, Types of pegmatites in the Archean at Grand Canyon, Arizona: American Mineralogist, v. 22, p. 436-445.

Burt, D.M., London, D., and Smith, M.R., 1977, Eucryptite from Arizona and the lithium aluminosilicate phase diagram [abs.]: Geological Society of America Abstracts with Programs, v. 9, p. 917.