Columbia subject headings:
Sugar workers--Mexico--Morelos.
Sugarcane industry--Mexico--Morelos.
Harvard subject headings:
Sugar workers--Mexico--Morelos.
Sugarcane industry--Mexico--Morelos.
Princeton subject headings:
Sugar workers--Mexico--Morelos--Statistics.
Sugarcane industry--Mexico--Morelos--Statistics.
Sugarcane--Mexico--Morelos--Harvesting--Statistics.