by National Research Council (U.S.). Committee on Sedimentation

1928

by United States. Congress. Senate. Committee on Energy and Natural Resources. Subcommittee on Water and Power

1990

by United States. Congress. Senate. Committee on Energy and Natural Resources

2004

by United States. Congress. Joint Economic Committee. Subcommittee on Economic Growth and Stabilization

1980

by United States. Congress. Senate. Select Committee on National Water Resources

1960

by United States. Congress. House. Committee on Education and the Workforce