[Reston, Va.] : U.S. Dept. of the Interior, Geological Survey ; Arlington, Va. : [available from] Branch of Distribution, U.S. Geological Survey, 1978.
1978
[Reston, Va.] : U.S. Dept. of the Interior, Geological Survey ; Arlington, Va. : [available from] Branch of Distribution, U.S. Geological Survey, 1980.
1980