Blackwell's records contain the transcribed table of contents, or a detailed summary, or both, for English-language titles published since April 1992. The BTC file provides this resource and also enables librarians to incorporate this information easily and cost-effectively in local cataloging. All BTC records are based on Library of Congress cataloging. Contents notes are retrievable by title searches, which, in RLG's systems, retrieve chapter headings as well as titles of works.
Summaries are searchable through the abstract word index.
RLIN and Zephyr support full MARC versions of the BTC records for local technical processing purposes and provide, in the RLIN Books file, the location information needed by interlibrary loan departments. Eureka supports reference and research and enables end users to forward requests for interlibrary loan of material to their local ILL offices. In all systems, the BTC file is a separate, chooseable file. RLIN users cannot create or update records in the RLIN BTC file nor use any of the Transfer commands to copy a BTC record into another RLIN bibliographic file. RLIN interlibrary loan users can transfer BTC records into RLIN ILL requests.