Authors invest much time, money and talent in their books.
Please remember that a couple of pages of a copyrighted book/magazine article, manuscript, etc. can be copied for your personal research use. Any more than that, you need to obtain permission from the author. It's probably cheaper to purchase the book than to copy it.
There is a copyright notice posted at OGS by the copy machines. Please be aware of the laws regarding copyright infringement. I'm sure we all want to stay on the right side of the law.
For more information on copyright protocol check out this site. https://en.wikipedia.org/wiki/Copyright_infringement