Brian, thats the book I have...but buy it at amzon...you can get a nice good used copt for 12-14 dollars...the price for that book it way over what you have to pay.
Johnny, Notgeld are hyper inflationary emergency money (large bulk of it WWI WWII German paper money but there is france, japan, etc…)...and it is also coins...iften minted in Iron, Porcelain, and the like. They are usually printed and minted by townships and city (Stadt). They are wonderfully creative, funny, sometimes scary (anti-Semitic) themes that give you a look into the society of the time. I havent uploaded any of my paper notgeld but I have a few coin notgeld...I am going to branch my site off to devote a section just to it since I have been buying them up like crazy.

Iron coin from Stadt Duren, my favorite of all I have seen so far

Porcelain Coin from Saxony

Very large coin with a large nenomination…I have 10000 but some go as high as a billion.
when I get home I might upload a few of my hi res bills, some of them are just plain wonderful works of art, some are funny...I have some that are runs of bills that deal with daily life, beer, middle ages, etc...