This booklet is the fourth in a series of ten programed instruction units which was developed as a career related language arts program to teach library skills to junior high school students. The objectives of this unit are to demonstrate knowledge of the card catalog skills learned in part three of the series and to learn additional functions of the card catalog. Students must answer questions and complete "hands-on" activities to reinforce the cataloging skills to be mastered. The booklet is illustrated with cartoons and drawings. (JAB)