Even today, the catalogs of Dr. Arnold Keller are indispensable for any serious collector of German emergency money. The standard for emergency money and Zitierwerk the German inflation of 1923 is finally available for any collector. At 1248 pages the Notgeldausgaben has over 5,800 official and private dispensaries throughout the then German Reich are listed. The most extensive area of the German emergency money with most spending bill is nowhere else as extensively documented. A must for every bill and Notgeldsammler. WRITTEN IN GERMAN.