It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
The HathiTrust contain books out of copyright (pre-1928 for the most part).
Because the University of Missouri - Columbia is a Hathi member,
you can then download parts or all of a book if you prefer to read it off-line. Use the Login In button in the top right and enter University of Missouri - Columbia
as your institution and enter you pawprint after you are redirected to the UM Proxy Server.
You can read the book online as well, and there is full-text search capability.
The slide show below walks you through the process.