Stegmann, Hans-Lothar and Vennekate, Johann Kleine
Johann Kleine Vennekate Verlag
This lovely 217 page compendium of BMW models, printed on heavy, coated paper, is simply chock full of information. Nearly every model gets at least four pages, with many contemporary photos (often from private individuals), factory pictures and diagrams and advertisements. There's a large table in the back that has a tremendous amount of technical information about each model.
Doug Rinckes' book covers the electrical systems of the R25, R26 and R27 singles, as well as the R50-69S twins. It includes a great deal of information and procedures, and is heavily illustrated. Full color wiring diagrams are included, as well as specifications and common modifications. It's available from Bench Mark Works. It's softcover, wire bound, has 66 pages and 49 illustrations. Highly recommended!
Documents the day to day life of wartime German soldiers on their motorcycles. Includes detailed information on various paint schemes of German motorcycles during the course of the war, and detailed information on the BMW R75 and the Zundapp KS750. Available from Amazon.
Hdbd. 192 pages, over 300 ill.