What has the author Giselher Wirsing written?

Giselher Wirsing has written:

'Der Krieg 1939/41 in Karten' -- subject(s): Maps, World War, 1939-1945

'Schritt aus dem Nichts' -- subject(s): Social problems

'Die Menschenlawine' -- subject(s): Population

'The war in maps, 1939/40' -- subject(s): Campaigns, World War, 1939-1945