[ChrisS]

Hs 126:

1) Squadron-Signal - In Action n02 - Luftwaffe (Part 2) has some pages
2) Hs 126 by Avia Press The only complete book but in Polish!!!!!
3) Aufklaerer Vol1-Luftwaffe Reconnaissance Aircraft & Units 1935-41 has a section
4) Aufklaerer Luftwaffe Reconaissance Aircraft & Units 1935-45 (Hikoki Publications) has a section.
5) Hs 126 Mushroom Models. Small format tiny pictues good attempt but awful format

But no complete history in English. Amazing considering the pivitol role this aircraft played in the early Blitzkrieg!!