Sturmey Archer motorcycle books include the full history of this company that manufactured gear hubs.
Sturmey-Archer are a manufacturing company originally from Nottingham, England. They primarily produce bicycle hub gears but have also produced motorcycle hubs.
The Sturmey-Archer Story by Tony Hadland (1987) is dedicated to the ingenious designers, past and present, of Sturmey-Archer hubs.
The Sturmey-Archer Countershaft Gear (c.1970s) All about the Sturmey-Archer countershaft 3-speed gear. A facsimile of sales brochure first printed 1916, includes details of the gear box and specifications.