Columbia subject headings:
African American labor union members--History--20th century--Sources.
Brotherhood of Sleeping Car Porters--History--Sources.
Discrimination in employment--United States--History--20th century--Sources.
Harvard subject headings:
African American labor union members--History--20th century--Sources.
Brotherhood of Sleeping Car Porters--History--Sources.
Discrimination in employment--United States--History--20th century--Sources.
Princeton subject headings:
African American labor union members--History--20th century--Sources.
Brotherhood of Sleeping Car Porters--History--Sources.
Discrimination in employment--United States--History--20th century--Sources.