Columbia subject headings:
Conglomerate corporations--United States--History.
Consolidation and merger of corporations--United States--History.
Directors of corporations--United States--History.
Harvard subject headings:
Conglomerate corporations--United States--History.
Consolidation and merger of corporations--United States--History.
Directors of corporations--United States--History.
Princeton subject headings:
Conglomerate corporations--United States--History.
Consolidation and merger of corporations--United States--History.
Directors of corporations--United States--History.