United States. Congress. Senate. Committee on Agriculture, Nutrition, and Forestry. Subcommittee on Agricultural Production and Stabilization of Prices
Levelton Consultants.; National Cooperative Highway Research Program.; American Association of State Highway and Transportation Officials.; United States. Federal Highway Administration.; National Research Council (U.S.). Transportation Research Board
National Research Council (U.S.). Committee on the Geologic Record of Biosphere Dynamics, National Research Council (U.S.). Division on Earth and Life Studies, National Academies Press (U.S.)
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