Columbia subject headings:
African Americans--History--Sources--Bibliography--Microform catalogs.
Documents on microfilm--Catalogs.
National Archives (U.S.)--Microform catalogs.
Harvard subject headings:
African Americans--History--Sources--Bibliography--Microform catalogs.
Documents on microfilm--Catalogs.
United States. National Archives and Records Service--Microform catalogs.
Princeton subject headings:
African Americans--History--Sources--Bibliography--Microform catalogs.
Catalogs.
Documents on microfilm--Catalogs.
National Archives (U.S.)--Microform catalogs.