Baker, N.T., and Capel, P.D., 2011, "Environmental factors that influence the location of crop agriculture in the conterminous United States": U.S. Geological Survey Scientific Investigations Report 2011–5108, 72 p.
Brush, L. M. (1961). "Drainage basins, channels, and flow characteristics of selected streams in central Pennsylvania" (pp. 1-44) (United States, U.S. Department of the Interior, GEOLOGICAL SURVEY). Washington D.C.: UNITED STATES GOVERNMENT PRINTING OFFICE. Retrieved October 29, 2017, from https://pubs.usgs.gov/pp/0282f/report.pdf
↑ รศ.ดร.ไพบูลย์ ภูริเวทย์, การจัดการทรัพยากรธรรมชาติโดยหลักชีววิทยา,บทที่ 4 "ดิน" หน้า 83. ISBN 974-599-193-7
Summerfield, M.A., 1991, Global Geomorphology, Pearson, 537 p. ISBN9780582301566
กันยายน 07, 2021
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