NGPA Determinations (5.4 mb)
This is a historical spreadsheet that shows the Natural Gas Policy Act (NGPA) Determinations on federal and Indian gas wells which qualified under the NGPA when it was still in effect.

Tight Gas Sand Designated Areas
This is a historical spreadsheet that shows the areas designated as tight gas sand reservoirs that qualified under the Natural Gas Policy Act (NGPA) as Tight Gas Sand Reservoirs on federal and Indian gas wells.