Originally Posted by PBL
It's hard to believe that Boeing doesn't have a company historian.
I had this problem with Bell when researching for a book many decades ago. They kept sending printed cards telling me to "contact my local library". This was a bit pointless, a library in the uk wouldn't know a lot about Bell designs. After a bit of though I wrote to their local library in Buffalo. The result was soooo surprising, a kind letter from the librarian with a whole stack of reference material and past company newsletters for the era I was interested in. She also said she had looked up the then President in the phone book and gave me his address. I wrote to him, explained what my interest and he went back into work, he still had an office there, and dug out all sorts of research material and photos. He converted a gap in the book into a really interesting section. So keep trying, in particular
Seattle Public Library and the local
Museum of Flight, they may have volunteers who will be happy to look through their archives and make copies for you.