Building Spruce Bi-Planes WW1..1918 cool Film

I used to wander around libraries when I was young. Fortunately, I lived in Baltimore (fortunate in those times) where the Enoch Pratt Library was located, and the Library of Congress and National Archives were less than an hour away by car or train. Now I wander around the Internet, discovering things that I wasn't even looking for (just as I did in libraries), such as this film on the building of spruce biplanes. Fascinating