The third of three volumes included in a secondary agricultural supplies and services curriculum guide, this volume contains twenty-five units of instruction in the area of agricultural mechanics. Among the unit topics included are (1) Farm Safety, (2) Ignition Systems; (3) Servicing Wheel Bearings, (4) Oxyacetylene Cutting, (5) Servicing the Tractor, (6) Fasteners, (7) Blueprint Reading, (8) Baler Operation and Maintenance, (9) Electrical Safety, (10) Fundamentals of Electricity, (11) Farm Fuels, and (12) Electrical Wiring Practices. Each unit follows a typical format which includes terminal objectives, specific objectives, suggested activities, instructional materials, references, information sheets, transparency masters, assignment sheets, tests, and test answers. (LRA)