There is so much to say about Emergency Money - and in extention about replacement coupons - that a bit of a guidline might be useful.
To make a difference with 'banknotes', let's state that banknotes are issued by the National Bank of a country (or a group of countries), notes that are issued by the National Mint of a certain country, or by a government ruling a certain area on a certain moment.
In this set of articles on Emergency (and replacement money), we talk about notes/coins and coupons that are issued by private organisations, non-profit organisations, cities, towns, ... in order
a) to replace coins or notes because there's a shortage of official coins/notes
c) to replace national currency because of heavy inflation
d) to replace national currency to avoid national currency leaving the country (tourist currency)
e) to replace national currency to give a number of people access to other products (like for military, foreigners, ....)
f) to pay employees in a way that they were forced to use their 'money' to spend in shops owned by the company that issued the 'money' - Nazi concentration camp 'money' is a similar type of money.
I might have forgotten some categories, but at least we're more or less clear about the difference with bank notes.
Not in this category are the French, British, Russian 'assignats' - although they were replacing silver and gold coins as well. They were a stage between the use of gold/silver towards the use of banknotes as a general way of making payments.
Besides that, they are in all 'banknote' catalogues, so they can be considered as 'banknotes'.
In what follows, I will try to pay attention to the following themes :
A (was introduction)
B : for Emergency Money issued at the beginning of WWI
C : "Grossgeld" - emergency money for higher values than the usual circulation coins
D : "Serienscheine" - the 'fancy' Notgeld issues of (mainly) Germany in the 1920's
E : Inflation money
F : Inflation-proof money
G : Military money - Prisoners money - War Occupation money
H : Coupons other then the WWI coupons
I : Tourist money
check previous items and more to follow ....
contributions are welcome