Columbia subject headings:
Harvard subject headings:
Documents on microfilm--Washington (D.C.).
Germany. Kriegsmarine. Oberkommando--Archives--Microform catalogs.
Germany. Kriegsmarine. Oberkommando--History--20th century--Sources--Bibliography--Microform catalogs.
Spain--History--Civil War, 1936-1939--Naval operations, German--Sources--Bibliography--Microform catalogs.
United States. National Archives and Records Administration--Microform catalogs.
World War, 1939-1945--Naval operations, German--Sources--Bibliography--Microform catalogs.
Princeton subject headings:
Documents on microfilm--Washington (D.C.).
Germany. Kriegsmarine. Oberkommando--Archives--Microform catalogs.
Germany. Kriegsmarine. Oberkommando--History--20th century--Sources--Bibliography--Microform catalogs.
Spain--History--Civil War, 1936-1939--Naval operations, German--Sources--Bibliography--Microform catalogs.
United States. National Archives and Records Administration--Microform catalogs.
World War, 1939-1945--Naval operations, German--Sources--Bibliography--Microform catalogs.