Columbia subject headings:
Strikes and lockouts--Stevedores--United States.
Strikes and lockouts--Stevedores.
United States--Economic conditions.
Harvard subject headings:
Strikes and lockouts--Stevedores--United States.
United States--Economic conditions--1961-1971.
Princeton subject headings:
Strikes and lockouts--Stevedores--United States.
United States--Economic conditions--1961-1971.