Map features include:
State lines/names, county lines/names, county seats/names,
Additional cities and towns/names, basement rock outcrops/names
Sedimentary basins/names, major tectonic features/names,
Oil and gas production combined into one color.
Gas pipelines color coded and numbered to show ownership, major interconnects,
13 Canadian pipelines shown, 52 U.S.A. pipelines shown