Columbia subject headings:
Harvard subject headings:
Fortification--France--Margival.
Germany--Armed Forces--Headquarters.
Germany. Wehrmacht. Oberkommando.
Hitler, Adolf, 1889-1945--Homes and haunts--France--Margival.
Margival (France)--Buildings, structures, etc.
Princeton subject headings:
Germany--Armed Forces--France--Headquarters.
Germany--Armed Forces--History--World War, 1939-1945.
Germany. Wehrmacht. Oberkommando