some oldies..
Here are some original handbooks and ETK of pre-war BMW cars. Tried to make you see the type of the vehicule, via small BMW recognition book..
Finally I found a link with more explicite photos.
I have some doubt on the origin of the H/B of the 3/15 PS as it is almost immaculate..
but it was guaranteed original by seller (1932) (?).
..And I miss the 335 ETK as it is -I don't know why- "only a few pages" (BMW Archiv).
Only post-war is the following 340 (1951).
BMW 340 Eisenach (1951).
BMW335 (1939)
BMW 328 (1938) 327 (1937-39)
BMW 321 (1939) BMW 326 (1938). with order of the car.
BMW 325 Kubelwagen (rare) 1938.
BMW 315 (1935) BMW 309 (1934).
BMW 320 (1938) BMW 319 (1935)
BMW 303 (1933)
BMW 3/20 PS (1933).
BMW 3/15 PS (1932).
Last, is a flat rate manual of 02/1938.
Here is the link for the pix of cars. (Hope it works !)
So "primitive cars", but parts of BMW history.
http://www.autogallery.org.ru/pbmw.htm