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Identify the seal handwriting; Reading vertically from the right:
Li qun
Shijie
Author Li Qunjie (192 1-2008), whose name is Jeff. Lijiang, Yunnan, Naxi nationality. He used to be director of China Calligraphers Association, chairman of Yunnan Calligraphers Association, consultant of China National Museum Gallery, and president of China Historical Society of Yunnan Province.
Baidu Baidu picture-Li Qunjie's works and seals (printed separately for comparison):