Cycle Guide Magazine June 1970 / Rickman 700, Bultaco Matador, Harley XR

Machine Design Magazine June 1976 Penton Mechanical Drives Reference Issue

1974 Dirt Bike Magazine Enduro Rider's Handbook Special Edition Vintage Bultaco

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

January 1970 Cycle Guide Magazine Ossa Pioneer 175cc

June 1970 Cycle Guide Magazine Bultaco Pursang, Matador

MOTOCROSS ACTION MAGAZINE-APRIL 1974-PENTON 250-HODAKA 125-SADDLEBACK TRANS AMA

JUNE 1970 MECHANIX ILLUSTRATED, SUZUKI T-500 TITAN, YAMAHA, BULTACO, KAWASAKI