I would be happy to help with sources if you like. Because I'm lazy, I've never put together a good page on numerical notations on the Phrontistery (just a massive bibliography which is no use to your students). The Wikipedia pages on numerical notations are mediocre at best, I'm afraid.

(Of course, my *actual* recommendation would be for me to send you the entirety of my 500-page book by PDF ... but probably that would be taking your research too far for this project!)