6 books • 3 series
Collected Papers Vol 4: 1958-1979 (Collected Works, #4)
Collected Papers (Contemporary Mathematicians)
Collected Papers Vol 1: 1921-1934 (Contemporary Mathematicians)
Collected Papers Vol 2: 1935-1944 (Collected Works, #2)
Collected Papers Vol 3: 1945-1957 (Collected Works, #3)
Metamathematische Methoden in Der Geometrie (Hochschultext)