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Business stationery (cover of a letter) used by the Institute of Photographic Chemistry at Academia Sinica in Beijing (Peking, China). The letter, dated 19 January 1988 was sent by Associate Professor He Guang-qian to Dr. Piotr NOWAK of Katedra/Zakład Fototechniki at Technical University of Wrocław (Poland).
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- Sunday 25 August 2019
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