Language: German. Here MICHEL readers can expect expanded specialist knowledge in this popular area in German philately. With Jürgen Hettinger's new work, collectors who are interested in posthistoric information will get much new information about this part of the history and creation of these collections, but at the same time also information about the possible use in the different German areas. In addition, the volume also contains the description of previously unknownspecial functions and numerous new illustrations. 752 pages