Columbia subject headings:
Competition--United States.
Consolidation and merger of corporations--United States.
Food industry and trade--United States--Consolidation.
Food industry and trade--United States--Vertical integration.
Food industry and trade--United States.
Industrial concentration--United States.
Meat industry and trade--United States--Consolidation.
Meat industry and trade--United States--Vertical integration.
Harvard subject headings:
Princeton subject headings:
Consolidation and merger of corporations--United States.
Food industry and trade--United States.
Industrial concentration--United States.