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American Association of State Highway [and Transportation] Officials. 1970. Standard specifications for highway materials and methods of sampling and testing. Ed. 10, 2 vol., illus.

(2)

American Society for Testing and Materials. 1974. Method for classification of soils for engineering purposes. ASTM Stand. D 2487-69. In 1974 Annual Book of ASTM Standards, Part 19, 464 pp., illus.

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Austin, Morris E. 1965. Land resource regions and major land resources areas of the United States. U.S. Dep. Agric. Handb. 296, 82 pp., map.

(4)

California Conservation Needs Committee. 1967. California soil and water conservation needs inventory 1967. 164 pp.

(5)

California Department of Natural Resources, Division of Mines. 1951. Geologic guidebook of the San Francisco Bay counties. Div. of Mines and Geology Bull. 154, 379 pp., illus.

(6)

California Division of Highways. 1963. Materials manual for testing and control procedures. Ed. 2, 2 vol., illus.

(7)

Gealy, William K. 1951. Geology of the Healdsburg quadrangle. Calif. Dep. Nat. Resources, Div. of Mines and Geology Bull. 161, 50 pp., illus.

(8)

King, Norton L. 1967. Napa County-an historical overview. 99 pp., illus.

(9)

Lemmon, Paul E. 1968. Grouping soils on the basis of woodland suitability. 3rd North Am. Forest Soils Conf. Proc.: 413-426.

(10)

Munz, Philip A., and David D. Keck. 1959. A California flora. 1681 pp., illus.

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Smith, G.D., F. Newhall, L.H. Robinson, and D. Swanson. 1964. Soil temperature regimes: their characteristics and predictability. Soil Conserv. Serv. Tech. Pap. 144, 14 pp., illus.

(12)

Society of American Foresters. 1954. Forest cover types of North America. Rep. Comm. Forest Types, 67 pp.

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United States Department of Agriculture. 1951. Soil survey manual. U.S. Dep. Agric. Handb. 18, 503 pp., illus [Supplement replacing pp. 173-188 issued May 1962] - Click here to see the new new edition of the Soil Survey Manual.

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United States Department of Agriculture. 1975. Soil taxonomy: a basic system of soil classification for making and interpreting soil surveys. U.S. Dep. Agric. Handb. 436, 754 pp., illus. Click here to see the new edition of Soil Taxonomy:  A Basic System of Soil Classification for Making and Interpreting Soil Surveys.

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United States Department of Agriculture, Soil Conservation Service (now Natural Resources Conservation Service). 1976. National range handbook. See. 300.

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Vlamis, J. 1949. Growth of lettuce and barley as influenced by the degree of calcium saturation of the soil. Soil Sci. 67: 453-466.

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Weaver, Charles E. 1949. Geology and mineral deposits of an area north of San Francisco Bay, California. Calif. Dep. of Nat. Resources, Div. of Mines Bull. 149, 122 pp., illus., maps.

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Wischmeier, Walter H., and D. D. Smith. 1965. Predicting rainfall erosion losses from cropland east of the Rocky Mountains. U.S. Dep. Agric. Handb. 82, 49 pp.