Deutsche Kolonien und Auslandpostämpter Stempelkatalog

The Deutsche Kolonien und Auslandpostämpter Stempelkatalog is a philatelic reference which describes and publishes values for the postal markings found on the stamps of the German colonies and German post offices abroad. The catalog is published by the Arbeitsgemeinschaft der Sammler Deutscher Kolonialpostwertzeichen.
The eighteenth edition was published in 2018. It features added content over prior editions, but also features fundamental changes to layout to improve the clarity of the content,