HathiTrust This link opens in a new windowGreat source for digitized books out of copyright (pre-1923) or in the public domain - can be downloaded as PDFs. Normally, that's its whole function. Currently, though, we have emergency access to a lot of more recent titles - but with strict limitations. They can't be downloaded, and only one person at a time can be viewing it. You'll have to log in as being part of DePauw and "check out" the book - you will get access one hour at a time.
If you're off-campus and you see that DePauw owns a print book, go ahead and *check* HathiTrust. It's possible it would be there.
Power tip: there are tons of hits, limit the search to "catalog" and uncheck the "full view" button to see all the temporary access options.