Columbia subject headings:
Agriculturists--Political activity--Mexico.
Economists--Political activity--Mexico.
Petroleum engineers--Political activity--Mexico.
Physicians--Political activity--Mexico.
Professional associations--Mexico.
Professional education--Mexico.
Professional employees--Government policy--Mexico.
Professional employees--Labor unions--Mexico.
Professions--Government policy--Mexico.
Trade associations.
Harvard subject headings:
Agriculturists--Mexico--Political activity.
Agriculturists--Political activity--Mexico.
Economists--Mexico--Political activity.
Economists--Political activity--Mexico.
Petroleum engineers--Mexico--Political activity.
Petroleum engineers--Political activity--Mexico.
Physicians--Mexico--Political activity.
Physicians--Political activity--Mexico.
Professional associations--Mexico.
Professional education--Mexico.
Professional employees--Government policy--Mexico.
Professional employees--Labor unions--Mexico.
Professions--Government policy--Mexico.
Trade associations--Mexico.
Princeton subject headings:
Professional education--Mexico.
Professional employees--Government policy--Mexico.
Professions--Government policy--Mexico.