Columbia subject headings:
Food industry and trade--Mexico--Mexico City--History--20th century.
La Merced (Mexico City, Mexico)--History.
Markets--Mexico--Mexico City--History--20th century.
Merchants--Mexico--Mexico City--History--20th century.
Wholesale trade--Mexico--Mexico City--History--20th century.
Harvard subject headings:
Grocery trade--Mexico--Mexico City--History--20th century.
La Merced (Mexico City, Mexico)--History--Economic conditions--20th century.
Princeton subject headings:
Grocery trade--Mexico--Mexico City--History--20th century.
La Merced (Mexico City, Mexico)--History--Economic conditions--20th century.