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西单民主墙前不知名照相的 (1979年6月)
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Most of the photos on the following pages have been taken by Helmut Opletal during his stays in China between 1979 and 1984. Others (especially in the introductory part) have - over the years - been made available from private archives by other observers or participants of the Democracy Movement. Special thanks for providing photos and/or other documentary material is extended to Chen Ziming, Nancy Hearst （H.C. Fung Library/Harvard University，南希·赫斯特，哈佛大学费正清研究中心 H.C.Fung 图书馆), Hu Ping, Huang Rui, Martin Krott（马丁）, Li Shuang, Ma Desheng, Jacqueline Nivard（倪娃儿）, Alain Peyraube（贝罗贝）, Wang Keping, Xu Wenli, Yan Li, Friedrich Zettl（蔡特尔）and the Universities Service Centre at the Chinese University of Hong Kong （香港中文大学中国研究服务中心）.
A very few photos though could not be traced back to their sources, for indications about original photographers and copyright, please contact the author.