30.5.11

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"ON MAY 9 (FRIDAY) AND MAY 30 (FRIDAY) 1969 AT 3:00 GREENWICH MEAN TIME (9:00 EST) JAN DIBBETS WILL MAKE THE GESTURE INDICATED ON THE OVERSIDE AT THE PLACE MARKED X IN AMSTERDAM, HOLLAND"

Jan Dibbets, New York, 09.05.1969, postcard A6, published by Seth Siegelaub