I don't usually read a lot of books unfortunately, but I remember a friend once told me to check out a book called Accessibility Handbook: Making 508 Compliant Websites by Katie Cunningham
Maybe that can help.
But I'll dig deep into my networks and find better book recomendations to give.
Also, I would advise going to tech twitter and following some amazing accessibility experts/speakers. They might have some good recommendations.
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