| บรรณานุกรม | USDA.1975.A Basic System of Soil Classification System for Making and Interpreting, Soil Surveys, Soil Survey Staff.Agricultural Hanbook no.364.U.S.Department of Agriculture.U.S.A.USDA.2003.Keys to Soil Taxonomy : Ninth Edition, 2003.United States Department of Agriculture Natural Resources Conservation Service.U.S.A.) |
| ชื่อทรัพยากร | A Basic System of Soil Classification System for Making and Interpreting, Soil Surveys, Soil Survey Staff |
| ชื่อผู้แต่ง | USDA( 3) |
| แหล่งทรัพยากร | - |