Maintenance and repair Automobiles 39 Thesis 22 Airplanes 17 Microcomputers 16 Dissertations, Academic 15 Dwellings 12 Amateurs' manuals 10 Upgrading 9 Equipment and supplies 8 Design and construction 7 Management 7 Ships 7 Handbooks, manuals, etc 6 Boats and boating 5 Electric equipment 5 Electronic apparatus and appliances 5 Motor vehicles 5 Vehicles, Military 5 Airplane 4 Computer 4 Computer networks 4 Electric apparatus and appliances 4 Examinations, questions, etc 4 Motors 4 Radar 4 Remodeling 4 Air conditioning 3 Airlines 3 Building 3