Columbia subject headings:
Baltimore (Md.)--Economic conditions.
Baltimore (Md.)--History.
Baltimore (Md.)--Social conditions.
Harvard subject headings:
Baltimore (Md.)--Economic conditions.
Baltimore (Md.)--History
Baltimore (Md.)--Social conditions.
Princeton subject headings:
Baltimore (Md.)--Economic conditions.
Baltimore (Md.)--History.
Baltimore (Md.)--Social conditions.