The Hydra-Glide turns into the Duo-Glide
Mechanics & Owners Guide to 1941-1959 Harley-Davidson O.H.V. Big Twins
Mechanics & Owners Guide 1941-1959 Harley-Davidson OHV Big Twins – Vol. 2
Harley-Davidson Panheads 1948-1965: Service, Repair, Maintenance