Scouts and Guides Free Stamp Catalogue, Edition 2023
The ArGe Pfadfinder has been using the "Pfadfinder Freistempel Katalog" since at least the 1980s. This catalogue has become the most important reference work for identifying scout postmarks. The Arbeitsgemeinschaft Pfadfinder (Germany) and Scouts on Stamps Society International (SOSSI) have collaborated to produce this fourth digital and informative edition of the "Scout and Guide Meter Stamp Catalogue".