Take a look at DVE’s sister project at the Proteus Project at UMass Amherst.
“an infrastructure to enable library patrons to discover and find connections within and across books. Examples include finding how quotations occur over time, discovering which parts of books are republished and in which combinations, recognizing names of people or locations and disambiguating them using Wikipedia, and searching the books’ contents, the entities mentioned in them, and the pictures they contain.”
You can try out a demo.
Some of the technology in the Proteus Project was originally planned as part of DVE, but was eventually built in a separate funding strand.