The Birth of Motocross: An Illustrated History of the Early Years of America's #1 Dirt Sport - The Tracks - The Riders - The Machines: Schleicher, Robert: 9781583883310: Amazon.com: Books
The Most Memorable Bikes of the 1970s - ADB Magazine
Our Racing Heritage - 1970 - Yamaha Motor Europe
My dad, a champion motocross racer, in the 1970s with his beloved Yamaha. : r/OldSchoolCool
The Lives They Lived - Racer X
motocross 70s scrub – WHIP
1970s Vintage Motocross Photos on Flickr | motobrief.com