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- [Reston, Va.] : U.S. Dept. of the Interior, U.S. geological Survey, [1999]
- Physical Details
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- data file
- OCLC
- ocm44188990, on995470000002341528
- Title from PDF title screen (viewed on August 26, 2004).
- "April 1999."
- Mode of access: Internet from the USGS Web site. Address as of 8/26/04: http://mac.usgs.gov/mac/isb/pubs/factsheets/fs08599.pdf; current access is available via PURL.