Machine Design Magazine June 1973-1974 Penton Mechanical Drives Reference Issue

Cycle Magazine Vtg 1976 Yamaha 750 Suzuki Triumph Penton Pomeroy Jeep

Machine Design Magazine February 1973-1974 Penton Plastics/Elastomers Reference

Racer X Illustrated Aug Sept 1999 Motocross Magazine John Penton Shane Watts

Machine Design Magazine April 1972-73 Penton Electronic Motors Reference Issue

Machine Design Magazine April 1975 Penton Electric Motors & Controls Reference

August 1972 Dirt Bike Magazine, Sand Riding, Maico 400, Penton 125 Enduro,

4 TH ISSUE JUNE 1970 NEW ENGLAND TRAIL RIDER MAGAZINE TRIALS PENTON BULTACO OSSA