1. Alexander, E. B. 1974. Soil Sci. Soc. Am. Proc. 38: 121–124.
2. Arkley, R. J. 1964. Soil Survey of the Eastern Stanislaus area, California. U.S.D.A., S.C.S. Soil Surv. 1957, No. 20.
3. Bartholomew, W. V., and D. Kirkham. 1960. Trans. 7th Int. Congr. Soil Sci 2: 471–477.
4. Birkeland, P. W. 1968. In Means of Correlation of Quaternary Successions, R. B. Morrison and H. E. Wright, Jr., eds., pp. 469-500. Congr. Int. Ass. Quat. Res. 8.
5. Birkeland, P. W. 1974. Pedology, Weathering and Geomorphological Research. Oxford Univ. Press, New York.