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  1. 1
    Directory of assistance centers of the National Water Data Exchange (NAWDEX) /
    by Edwards, Melvin D.
    Published 1980
    Government Document Book
  2. 2
    Identification codes for organizations listed in computerized data systems of the U.S. Geological Survey /
    by Edwards, Melvin D.
    Published 1981
    Government Document Book
  3. 3
    Definitions of components of the water data sources directory maintained by the National Water Data Exchange /
    by Edwards, Melvin D.
    Published 1982
    Government Document Book
  4. 4
    Plan for the design, development, implemenation, and operation of the National Water Information System /
    Government Document Microform Book
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