The 3-year retrospective catalog conversion project described involved the conversion of 446,913 selected monographic records of six major New York State research libraries into machine readable format. The records were searched against the OCLC, Inc., data file. If a match or an identical record was found, the corresponding OCLC record was revised to include the call number and locator information of the participant. A complete catalog record was entered into the data file for any record unique to the file. Objectives of the project include the strengthening of the resource capabilities of New York's major networks--the New York State Interlibrary Loan Network and the State University of New York/OCLC. Included in the report are discussions of the project's participants and its history, conversion administration and staffing, conversion methodology, and quality control. The bulk of the report consists of six appendices: (1) schedule of tasks implemented, (2) surveys of participants' shelflists, (3) a list of subject collections contributed by participants, (4) photocopying instructions, (5) job descriptions, and (6) input procedures. (RBF)