Literature inventory, as well 80 booklets of the study group China from the years 1974 / 2008, Heft-no. 21 / 33.39 / 64.70, 95 / 120, 122 / 128.131.135 / 138.141 / 142, furthermore as well catalogue the First flight letters 1949 / 1995, original Chinese special catalogue 1999, a treatise over the bilingual date stamp in of the PRC, a German / English / Chinese code book the philately and an auction catalog