Click either of the "read online" links to go right to the text of the book.
From here, you can move through the pages in order...
...jump to a spot in the table of contents...
...or search for words in the text.
For some books, you can also download PDF files of individual chapters. You are limited to downloading 40% of the book, and the detail page will show you how many pages that is.
On the details page, just scroll down to the chapter list, and click "download" next to the chapter you want.
The PDF files are yours to keep forever. They contain no security software and will not disappear or lock after a certain amount of time.