Numista is good when it comes to information about World Banknotes. There many sites who offers information on world banknotes but there are a very few websites that present well-categorized information about world banknotes. One of them is Mintage World. It is basically an online museum where banknotes of different countries are segmented and organized based on various factors. The website also has links to high resolution images of world notes, using which you can do your research!
