Camera On 22 Krupp Protze Lorry, is number 22 in the “Camera On” series published by MMPBooks/Stratus. The author, Alan Ranger, has written several books in this series with subjects such as “Sd. Kfz.7 Mittlerer Zugkraftwagen 7T Vol.2”, “German Horse Power”, and “The Einheits-Diesel WW2 German Trucks” and numerous others relating to WWII.