There are several ways to search HathiTrust content.
Articles & Books search on the River Campus Libraries' homepage.
For more information about searching, see Help - Using the Digital Library on HathiTrust's website.
After logging in at HathiTrust as a member of the University of Rochester, a link on the left of full view volumes allows you to download the entire volume as a PDF file. Downloading is for the entire volume and cannot be configured for single chapters or page ranges.
Without logging in, downloading (and subsequent printing) is limited to one page at a time in PDF for full view volumes (titles in the public domain and those with Creative Commons licenses).
Find out more at Help - Downloading.