This catalog presents brief descriptions of all lessons developed by the PLATO project for community colleges and adult education. One hundred six lessons are available for computer-based use. Topics range from elementary arithmetic to function theory and trigonometry. For each of these lessons, this catalog presents the title, code name, author, and a description of the lesson. Lesson descriptions include notations of grade and subject area, amount of student time and computer space needed, a statement of the lesson objectives, and a delineation of the lesson sequence. For most lessons, sample computer displays are pictured. Three programs which allow students to comment upon lessons and teachers to gain information concerning student progress are also provided. (SD)