https://ngmdb.usgs.gov/Geolex/Units/
https://ngmdb.usgs.gov/Geolex/stratres/
https://ngmdb.usgs.gov/Info/dmt/
https://ngmdb.usgs.gov/Info/partners.html
https://ngmdb.usgs.gov/Info/reports/
https://ngmdb.usgs.gov/Info/standards/
https://ngmdb.usgs.gov/Prodesc/