The photo is from the book "Harley-Davidson 1930-1941 - Revolutionary Motorcycles & Those Who Rode Them". This book is still in print, so we have to respect author Herbert Wagner's copyright. The doctrine of "Fair use" only allows us to go so far.
This is a wonderful book which you really should add to your collection. Wagner describes the Harley-Davidson founders and company starting with the huge VL engine debacle, struggling through the Great Depression, development and introduction of the revolutionary OHV Knucklehead, and ends as WWII begins. It's a tremendous history lesson just from this respect.
The focus of the book is really on the riders - both individual and motorcycle clubs - you know those guys and gals who all wore matching uniforms (I think my local AMCA chapter needs these), met at their club's clubhouse, and put on large organized rides and competition events. These clubs provided a large part of the motorcyclist's social life back then. But then WWII happened, and the clubs didn't regroup after the war ended. Wagner's book features hundreds of photos of the riders and their activities.
You can get a brand new copy of this book at
Amazon or from the
publisher. The price is less than a case of good beer. Or four quarts of genuine motor oil.
Used copies can be had for less.
Amazon and
Abe Books have copies at various prices.