Okay, figure this one out for me. Check out this Umlaut page:
Umlaut contacts Google Book Search to ask about that citation, and Google says they don’t have full text, but do have a metadata record. You can click on the “book information from google book search” link to see that very GBS page.
HathiTrust on the other hand, says they DO have full text–and provides fulltext via a GBS preview widget, as you can see here.
And also EZProxy problems
If you try to click on the HathiTrust link on the Find It page, you’ll see another unrelated problem. HathiTrust URLs are now expressed as hdl.handle.net URLs. hdl.handle.net is included in our EZProxy config for other reasons. So Umlaut thinks it needs to send HathiTrust urls through EZProxy, and will ask you to login before following the link. Even though it’s free.
Next time I hear someone saying we don’t need an actual non-hacky authentication solution to third party licensed content (like openid or shibboleth), because EZProxy works just fine, I’m remembering this example.