Columbia subject headings:
Harvard subject headings:
Petroleum industry and trade--Social aspects--Mexico, Gulf of--Case studies.
Petroleum workers--Social aspects--Mexico, Gulf of--Case studies.
Syndicalism--Mexico, Gulf of--Case studies.
Princeton subject headings:
Case studies.
Industrial relations--Mexico, Gulf of, Region--Case studies.
Industrial relations--Mexico--Agua Dulce (Agua Dulce).
Petroleum industry and trade--Social aspects--Mexico, Gulf of, Region--Case studies.
Petroleum industry and trade--Social aspects--Mexico--Agua Dulce (Agua Dulce).