These problems are to be used in the study of chapters 1-24. The Study Guides present objective questions and matching excercises that cover the presentation of each chapter. Blank forms are provided for each Recycling Problem. Printed on each page is the number of the problem in the textbook for which the form is to be used. Specific instruction numbers are also shown. You may be required to use every form that is provided. The pages are perforated for easy removal.