Term selection methodology used in the Subject Access Project is outlined in this manual. This project was designed to demonstrate how a card catalog in machine-readable form can be augmented to allow greater subject access to the information content of a library collection. Rules and regulations for selecting words from indexes and contents pages to supplement Library of Congress classification, subject headings, and title words are intended to insure selection of significant subjects and useful search terms. Procedures are presented for determining the usability of contents pages, selection of entries from the contents pages, and selection of entries from the index. Following these rules, words and phrases were selected for a sample library collection of approximately 2,000 titles, put into machine-readable form, and merged with the MARC-like records already available to create a new data base, BOOKS. Some comparison searching using MARC records alone was done on the Library of Congress SCORPIO system; separate reports document these trial searches. A flow chart of the selection procedure and sample pages are included in the appendices. (Author/KP)