Columbia subject headings:
Industrial relations--United States--Case studies.
Merchant mariners--Labor unions--United States.
Merchant mariners--United States.
Harvard subject headings:
Industrial relations--United States--Case studies
Merchant marine--United States
Merchant mariners--Labor unions--United States.
Princeton subject headings:
Case studies.
Industrial relations--United States--Case studies.
Merchant marine--United States.
Merchant mariners--Labor unions--United States.