Autism is so common these days (the latest estimate in the U.S. is 1 in 45 children) that the autism section of the bookstore or library doesn’t come close to resembling the autism section of 1975 when the autism rate was considered to be about 1 in 100,000. I know this for a fact because I actually read all the books in my local library back then; I don’t remember the exact number, but I’d say there were less than 10. In contrast, I checked for “autism” in the “books” category on Amazon today and got back 15,538 items.