References Cited
Am. Inst. Min. Met. Eng., 1949; Industrial Minerals and Rocks, Zd ed., pp. 748-755.
Am. Soc. for Testing Materials, 1944, Standards on Mineral Aggregates, Sept.
Cook, R. H.. 1951, Petrographic Memorandum 51-1, U. S. Bur. Reclamation, Jan. 8.
Diller, J. S., and Patton, H. B., 1902, The geology and petrography of Crater Lake National Park, Oregon: U. S. Geol. Survey Prof. Paper 3.
Moore, B.N., 1937, Nonmetallic mineral resources of eastern Oregon: U. S. Geol. Survey Bull. 875.
U. S. Bur. Mines, 1948, Minerals Yearbook, 1946, p. 107.
U. S. Bur. Reclamation, 1949, Concrete Manual, 5th ed., Sept.
Williams, Howel, 1942, The geology of Crater Lake National Park, Oregon: Carnegie Inst: Washington Pub. 540.
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