You can go to Scribd.com (as I did) and open an account. Scribd.com will give you 30 days free trial and Scribd will ask for your PayPal email in order to verify that you are you. So you have 30 days to download all the free documents, and on 29th day you have to cancel. I've done it more than once and Scribd is a fair player, they'll cancel.
Not Scribd has tons of UFO books, but more than anything they have the old MUFON magazines, which I find to be very high quality and unmatched when it comes to well-researched stories nobody ever heard off.
When it comes to their $10/mo subscription, it's not as good as Amazon's because Amazon has more titles and to my frustration, I found that the book which is available on Amazon is not available on Scribd.
Enjoy.