Resources for the twenty-first century : proceedings of the international centennial symposium of the United States Geological Survey, held at Reston, Virginia, October 14-19, 1979 /
F.C. Whitmore, Jr., and M.E. Williams, editors.
- 1 online resource (xvi, 345 pages) : illustrations (some color).
- Geological Survey professional paper ; 1193 .
- Geological Survey professional paper ; 1193. .