Columbia subject headings:
Harvard subject headings:
Fortification--Germany
Fortification--Germany--Ziegenberg.
Germany--Armed Forces--Headquarters.
Hitler, Adolf, 1889-1945--Homes and haunts--Germany--Ober-Mörlen.
Hitler, Adolf, 1889-1945--Homes and haunts--Germany--Ziegenberg.
Ober-Mörlen (Germany)--History.
Ziegenberg (Ober-Mörlen, Germany)--Buildings, structures, etc.
Princeton subject headings:
Fortification--Germany.
Germany--Armed Forces--Germany--Headquarters.
Germany. Wehrmacht. Oberkommando
Hitler, Adolf, 1889-1945--Homes and haunts--Germany.