I will say that we see a lot of requests for corrections through
HathiTrust, probably because people are accessing the full-text and it
is painfully obvious that there are mistakes and typos when they compare
the full-text to the catalog records. Also, they are online so it is
easier to fill out feedback forms compared to the disconnect of having
the book in hand and the catalog record online.
East Asian Studies Librarian, NACO coordinator
HathiTrust Bibliographic Corrections Support Volunteer