if you want - shoot me an email. I have a digital file that I use for textbooks for my ANA Summer Seminar early copper class. I can find some way to get it to you. it a bit of a monster at like half a gig. the file has some quick finders for the varieties. they arent as good as the books but they can really help narrow it down.
I collect low grade large cents. I currently have >230 Sheldon varieties and >235 middle date Newcomb varieties.