25 books • 5 series
Book #5: Audel Electric Motors
Book #8: Audel Machine Shop Basics
Book #10: Audel Automated Machines and Toolmaking
Book #17: Audel HVAC Fundamentals, Volume 1
Book #18: Audel HVAC Fundamentals – Heating Systems Components, Gas and Oil Burners and Automatic Controls V 2 4e
Book #6: Audel HVAC Fundamentals, Volume 3
Book #1: Heating Fundamentals Furn V1