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

Machine Design Magazine June 1976 Penton Mechanical Drives Reference Issue

DIRT BIKE MAGAZINE-JULY 1975 PENTON 250 CR250M1 ELSINORE MAICO 400MX VINTAGE

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

Machine Design Magazine April 1975 Penton Electric Motors & Controls Reference

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

Machine Design Magazine March 25 1982 Penton Machine Tool Technology

March 1973 Dirt Bike Magazine, 175 Penton, Yamaha 125MX, Honda SL125,Puch 175MX