I think I checked that book out of the library last winter, I may have to find it again.
I have always understood that the first Browns planted in the US were in the Pere Marquette River in Michigan. Actually they stocked in the Baldwin River, a small trib of the PM. When I used to go up there for occasional work and fishing the old timers always referred to them as "German Browns." Now of course this does not mean that their origin was Germany.
But John Holt claims the first eggs that came across the ocean were shipped by von Behr, but he doesn't point out the origin of the eggs.
Brown Trout | Michigan Sea Grant
Oh, and nice fish!