[Kaleun]

hi,

Clay blair's book is excellent, also for specific info on Grayling try

http://www.uboat.net/allies/warships/ship/2921.html

http://en.wikipedia.org/wiki/USS_Grayling_(SS-209)

Sadly as she was sunk:

http://www.csp.navy.mil/ww2boats/grayling.htm

http://www.oneternalpatrol.com/uss-grayling-209.htm

Kaleun