I think the photo comes from Roger Pierre's The Book of the Bicycle, c. 1973. It was printed in England and sold in the U.S. during the boom, a relatively thin hardback with many photos. There were many pix in there that appeared to be from the 50s and early 60s, including lots of shots of schoolboys riding dropped-bar bikes equipped with Sturmey gearhubs, lots of Carlton-built Raleighs, etc. Somewhere in that book is a photo of a gentleman in a loose short-sleeved buttoned shirt and touring shorts on a fixed or single-speed bike with fenders fording a creek, looking like he is participating in the old CTC touring/map-reading competition. There was a contemporary book that I no longer remember that had the same guy, same bike, same ride but a different location among its photos.