The Harley-Davidson Sportster is one of the longest-lived motorcycle families on the planet, with a history dating back to the 1950s.
Harley-Davidson Sportster Motorcycle History, CLASSICS REMEMBERED
Harley-Davidson Sportster History 1970-2013 - Haynes Manuals
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The Harley-Davidson Sportster - The Essential Free Buying Guide
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1957 Harley-Davidson Sportster XL - Motorcycle Classics
This vintage '1957 Sportster' is actually a brand new bike
A brief history of Harley-Davidson motorcycles