::I can definitely help with that - a while ago I tried to create a "Provinces of the Caliphate" article, but I shelved it because I could never work it into a satisfactory format. I posted a bunch of my sources for that article at this site; it's basically a number of province lists relating to various time periods. Hopefully they should be of assistance for what you need. Obviously the smaller provinces probably don't need their own category, but the bigger ones (Yemen, Sijistan/Sistan, Arminiyah, Mosul, Makkah and Madinah, etc.) could use one. On a related note, if you're looking for a list of provincial governors, Khalifah ibn Khayyat's Tarikh has a section for each of the caliphs from 'Ali to Harun, listing all of the governors during his reign for each major province, although his information sometimes conflicts with other sources. If you need help finding any information or sources, feel free to ask me anytime. Happy New Year to you too!