1. 1
    Published 1987
    .... ; For sale by the Books and Open-File Section,...
    Government Document Book
  2. 2
    Published 1988
    .... ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey,...
    Government Document Book
  3. 3
    Published 1983
    ...Dept. of the Interior, Geological Survey ; Distribution Branch, Text Products Section, U.S. Geological Survey,...
    Government Document Conference Proceeding Book
  4. 4
    by McCartan, Lucy
    Published 1987
    .... ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey,...
    Government Document Book