I would say my collection is weak compared to some, but I got some gems. Some windsocks, and Profiles, standard. The local library has all the Profiles so I know where to go if I need a look. Some of the Smithsonian restoration books from the 80s. Usually if it says Spitfire or Camel, book or mag, I get it. When I was a kid in the hobby, it was all WWII, so lots of P-51, Spit, ... from those days. My dad liked WWII too so he would pick stuff up for me. Now it is mostly WWI stuff even though I did pick up a Hurricane book that is close to a step by step rebuild of one as possible. Some of those Japanese books are very detailed.