Banknote Images
There are several sources for world Banknote images
Here are a few…
https://colnect.com/en/banknotes
https://www.banknotes.com/images.htm
20th Century Physicists on Banknotes
https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.373.1547&rep=rep1&type=pdf
List of people on Banknotes
https://en.wikipedia.org/wiki/List_of_people_on_banknotes
World Banknotes
https://wbanknotes.blogspot.com/?view=flipcard
http://www.vincenzo.altervista.org/catalog/catalog.html
IBNS BankNotes of the year
https://www.theibns.org/joomla/index.php?option=com_content&view=article&id=138&Itemid=45
French Banknotes
http://www.frenchbanknotes.com/france.php?section=Old+Francs