Probably a question for bona fide historians.  If I were in your position, I'd scan some PDFs and start looking for a specialist on that era of American music.

That's quite a collection

Wow, 9 years since this posting.
Someone needs to GET A LIFE, if he's still here....
Anyway, old music has no value, unless you can google it and find a piece that is unknown or lost in transit.

Since this posting, I have had a 93 year old sax player friend pass, and inherited about 400 lbs of big band arrangements. He played and traveled with a number of groups in Ohio.
1945 throgh 1982.
All.... Basically worthless, unless you have a good big band willing to play through an arrangement, and decide whats good and unique.. 

Basically I feel like a hoarder. Way too much music for one sax player with limited time.