http://home.att.net/~C.C.Jordan/Shilling.html
http://yarchive.net/mil/avg_tactics.html
http://yarchive.net/mil/p40_dogfight.html
more general info from Usenet Archives:
http://yarchive.net/mil/index.html
For everybody who is interesting in it I must recommend the book by Gregory “Pappy” Boyington - The Flying Tigers .