http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Formed by the union of: Gulf Coast oil and gas world, Midcontinent oil and gas world, Northeast oil and gas world, Pacific oil and gas world, Southwest oil and gas world, and: Western oil and gas world.
Absorbed: Petroleum independent beginning with Sept. 1995 issue.
Merged with: Petroleum engineer international (Houston, Tex.) and: Euroil, to form: Hart's E&P.
Petroleum engineer international (Houston, Tex.)