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I don't know which sites you'll be visiting, but there's a book from the Approach Guides series by David Raezer and Jennifer Raeze called Maya Ruins of Mexico: Travel Guide to Chichen Itza, Tulum, Teotihuacan, Palenque, and more I think it might be a good intro before your trip.

Thanks Alex. I’ll have a look at that one. I picked up a few on Kindle Unlimited