Columbia subject headings:
Electric utilities--Energy consumption--Mexico.
Energy conservation--Mexico.
Energy consumption--Mexico.
Mexico. Comisión Federal de Electricidad.
Petroleum industry and trade--Energy consumption--Mexico.
Petróleos Mexicanos.
Harvard subject headings:
Electric utilities--Energy consumption--Mexico.
Energy conservation--Mexico.
Energy consumption--Mexico.
Mexico. Comisión Federal de Electricidad.
Petroleum industry and trade--Energy consumption--Mexico.
Petróleos Mexicanos
Princeton subject headings:
Electric utilities--Mexico--Energy consumption.
Energy conservation--Mexico.
Energy consumption--Mexico.
Mexico. Comisión Federal de Electricidad
Petroleum industry and trade--Mexico--Energy consumption.
Petróleos Mexicanos.