Thank you, thank you, thank you! Every one of your ideas was helpful. Usually I would just go to the library and take out all the books, but when I went last week, the travel shelves were extremely empty!
I reviewed my stack of travel books, and was surprised that I didn't have as much on Italy as I thought I did. My Lonely Planet is the one specific to the Lakes (as you suggested, ACraven), and then I have the Rick Steves. My husband has family in Italy and has been going there his whole life, so somehow we don't feel we need guide books when we visit his family in Tuscany. His uncle is better than any book. :-)
I've ordered the Michelin Italy, because it has a bit about each of the areas. I may end up getting the Bradt (never heard of those), and the Lonely Planet and Rough Guide (they are both over 1000 pages), but I'll see.
Roberto di Firenze - yes, I made up "Eastern Italy" when I typed my question. It does sound odd, doesn't it! The trip I'm planning begins in Greece, and then we are looking at the ferry to either Bari or Brindisi. This would be a great chance to move up the eastern side of the country, because I can't really imagine going there on other trips (this will be my 6th time in Italy). I recently started following the Instagram account Castelliditalia, and I'm amazed at how many fabulous castles are in Le Marche, Abruzzo & Molise.
"Don’t be surprised at the scant info about Molise. It is known as the “Region that doesn’t exist”. " That made me smile. I think I've met Italians from every region, except that one. I love obscure places, so maybe I need to explore Molise. Thanks for the links.
Nelly - "Bradt Guides has an excellent book on just Abruzzo. It’s 5 years old now but the towns are still in the same places"
And that made me laugh out loud for real. Too true!
Thanks again all of you for your help.