Americabymotorcyclebook.com
BMW R 42 - 1926 by BigBlockAgency on Flickr.
Douglas TT Isle of Man 1923 by termokurt on Flickr.
Douglas? 1914 by termokurt on Flickr.

Douglas? 1914 by termokurt on Flickr.

Douglas TT Isle of Man 1923 by termokurt on Flickr.
Douglas TT Isle of Man 1923 by termokurt on Flickr.
BMW R 42 - 1926 by BigBlockAgency on Flickr.