Google Books are epub and pdf files. some are right protected; others 
are not. I'm not sure if the pdfs all have underlying text.

I don't know of an epub reader for the PC. Mac is supposed to have 
something called ReadHear, which I haven't tried yet. I suspect most 
screen reader users access epubs on their smart phones. Both Android and 
iOS devices have Google Books apps that are fairly accessible. I've only 
recently started reading Google books on my Android devices. So far, all 
the books I've tried have been accessible, but not all of the magazines. 
Since I've only been doing this for a few weeks, I don't feel comfident 
saying much more. I've included two links from the Google support pages 
below.

http://support.google.com/googleplay/bin/answer.py?hl=en&answer=1062949
http://support.google.com/googleplay/bin/answer.py?hl=en&answer=1062502


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