Amsterdam, 7.10.1948

Amsterdam, 25.9.1948

Amsterdam, 23.8.1948

New York, 21.5.1948

Palo Alto, 15.7.1948

Amsterdam, 13.4.1948

Amsterdam, 16.10.1947

Amsterdam, 2.10.1947

Amsterdam, 2.9.1947

Rom, 30.3.1946

Rom, 18.6.1945

Berlin, 12.2.1931

New York, 13.11.1941

New York, 26.5.1941

New York, 7.3.1940