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17. Herwath Walden's letter to MT. Berlin, 7 December 1918. |
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18. Der Sturm postcard with Herwarth Walden's portrait c. 1915. |
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19. Sturm postcard to MT. 19 March 1929. |
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20. The back page of the journal of Die Abstrakten artist group to MT. Berlin, 25 July 1927. |