http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Oil & gas producing industry in your state
Independent Petroleum Association of America
Compiled by: Independent Petroleum Association of America.
Published as an issue of Petroleum independent.
Petroleum Independent Publishers, Inc., 1101 16th St., N.W., Washington, D.C. 20036