Paratext

Reference Universe allows users to search the back of the book indexes and article titles of your print and e-reference simultaneously,and realize a return on the sizable investment libraries have made in their library's reference collection. You can find some accounts of the value some current customers have found in Reference Universe here.

Public Documents Masterfile is a low cost, continually growing bibliographic resource for locating public documents. "Public Documents Masterfile" improves all manner of document research providing electronic, single search access to the overwhelming majority of US government documents from 1774 to date and providing links to the full text, where available.  

19th Century Masterfile is the largest resource for research into the published output of Anglo-American (and additional non-English) materials produced prior to 1930. The goal is to include all relevant indexes to periodicals, books, newspapers, patents and US and many UK government documents. There are more than 8,000 periodicals, as well as extensive indexes sources for books, newspapers, patents and US and UK government documents.