This circular details the methods for investigating whether a work is under copyright protection, and, if so, the facts of the copyright. Both in-person searches at the Copyright Office and searches by the Copyright Office staff for a $10.00 per hour fee are detailed. The circular also explains the effect of the Copyright Act of 1976, which completely revised federal copyright law. A copyright search request form to be used when requesting a search by the Copyright Office is included. (EW)