Indeed, Hesham, the book is a "must have". In its ca. 400 pages it gives an overview - with some illustrations - of al the powered aircraft built in Germany until 1980 (and very occasionally of some unbuild projects).
An overview, and not a description in detail. Some descriptions are limited to one single sentence. Others (for instance the Ju 52) three pages...
The book is almost complete. Over the years I found some very old aircraft missing, and the author doesn't mention the aircraft industry of the GDR and its sole airplane model, the 152.
As a typical example I give the entry for the Ago E I:
E I (Ago Nr. 20). Eindecker, 88 kW (120 PS) Daimler II. Schneller Einsitzer, Vmax 140 km/h, "Kavallerie-Eindecker" genannt.
That's all.
The book Typenhandbuch der deutschen Luftfahrttechnik by Bruno Lange was edited in 1986 by Bernard & Graefe Verlag, Koblenz, in 1986 in the series Die deutsche Luftfahrt.
I don't know if it is still available (I bought it some 25 years ago).