Unless there's been a recent change, some if not all of the books with full view have a link that will convert it into a PDF for you. I've done this with several books. I've also converted some to text files. That's not ideal but is at least of some use if you want to copy and paste text and you only have the Adobe Reader which doesn't allow you to do that.
Edit: I'm looking at an old book now. If you go to the top right, it has a "Download" link and gives you the option to download in PDF or ePUB. The plain text option is there too as a separate link.
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