Columbia subject headings:
Germany. Heer. Artillerie--History.
Military reconnaissance--History.
World War, 1939-1945--Campaigns--Eastern Front.
Harvard subject headings:
Germany. Heer--Artillery--History.
Military reconnaissance--History.
World War, 1939-1945--Campaigns, Eastern.
Princeton subject headings:
Germany. Heer. Artillerie--History.
Military reconnaissance--History.
World War, 1939-1945--Campaigns--Eastern Front.