http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1 online resource (x, 890 pages) : illustrations, maps (some color).
"An examination of the origin and distribution of natural gases and the economics and environmental effects of developing gas resources for energy."
U.S. Geological Survey professional paper ; 1570