Most Google-digitized scans in Hathitrust are also available in Google, but a lot of European publications published after 1909 and before 1923 isn’t in Google as fulltext while HathiTrust is offering access for US-citizen. There are also books before 1909 which are not in Google e.g.
You can browse these books from outside the US by using an US proxy. (PDF-Download is limited to one page for not-affiliates of a HathiTrust partner institution.)
1. First choose a proxy
See e.g. the list at
2. Go to the proxy URL
3. Enter the HatiTrust URL
See the screencast http://screenr.com/Uxt