One for my German readers....
Kraft ohne Anstrengung ( Effortless Power in English)
I bought this in 1999 in Basel, Schweiz. It's a great book dealing with posture and structural alignment for effortless strength/power. The author, Dieter Allgaier, is a martial artist practising Taiji, Qigong, Escrima and Wing Chun.
The are some great exercises and a nice "teacups" Bagua one to help the reader understand the concepts.
I don't know if it is still in print but I think it is a lot better than many of the later structural type books I've seen since.