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ABSTRACT
The statistical elements of petrographic modal analysis are reviewed. The application of this procedure to soils and unconsolidated sediments is discussed and justified. Application of this method to obtain more complete quantitative estimates of mineralogical composition and pore space of soils should facilitate progress under the present system of soil classification and promote the use of objective criteria in new classification schemes.
1 Technical Paper 610, Arizona Agr. Exp. Sta., Tucson. Contribution from the Department of Agricultural Chemistry and Soils. Presented before Div. V, Soil Science Society of America, Nov. 16, 1959, at Cincinnati, Ohio.
3 Formerly Assistant Agricultural Chemist, Arizona Agr. Exp. Sta., now Soil Scientist, Meteorology Dept., U. S. Army Electronic Proving Ground, Fort Huachuca, Ariz.
Received for publication November 14, 1960. Accepted for publication June 21, 1961.
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