Columbia subject headings:
Archives--United States--Catalogs.
Migration, Internal.
United States. Committee for Congested Production Areas--Bibliography.
Harvard subject headings:
Archives--United States--Catalogs
Migration, Internal--United States
Migration, Internal--United States--History--Sources.
United States. Committee for Congested Production Areas--Archives--Catalogs.
United States. Committee for congested production areas--Bibliography.
Princeton subject headings: