[johnsjmc]

I had a 1911 set ,that were my grandfather,s . They were beautifully bound in suede and the pages were thin as tissue paper. There were whole chapters on diregible (sp.? balloon) design but little or nothing on airplanes. I poured over them as a child.
I kept them for years but sadly threw them away a couple years ago. I had loaned a couple to my brothers ex girlfriend for a high school project and they were never returned. If they had any collector value I am sure a part set wasn,t worth much.