This is the best I've found about the MiG-15. It has a few good photos and more about the defection. Test data is slim however:
http://www.historicwings.com/feature...tfindings.html
If anybody has more info concerning the Yak-9P I'd be very interested. What I've read until now is conflicting: some sources say the -9P was tested in Korea, some say it was shipped to the CONUS. Some say it force-landed, and some say it was captured on the ground.