Columbia subject headings:
Gas industry--Government policy--Mexico.
Natural gas--Mexico.
Privatization--Mexico.
Trade regulation--Mexico.
Harvard subject headings:
Gas industry--Government policy--Mexico.
Gas industry--Privatization--Mexico.
Natural gas--Government policy--Mexico.
Privatization--Mexico.
Trade regulation--Mexico
Princeton subject headings:
Gas industry--Government policy--Mexico.
Natural gas--Government policy--Mexico.
Privatization--Mexico.
Trade regulation--Mexico.