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A.L.s., in German, from Oskar Perron, Switzerland

• Mordell/1-40/19/19.102
• Item
• 3 August 1939

Part of Papers of Louis Joel Mordell

A.L.s., in German, from Oskar Perron, Diessen am Ammersee

• Mordell/1-40/19/19.103
• Item
• 30 May 1946

Part of Papers of Louis Joel Mordell