Had rhem both (hardback) for years....ABSOLUTELY INDISPENSABLE
Here's a link for the Clay Blair books....you'll need to search around for Hardback copies....there becoming something of a rarity
http://amazon.co.uk/s/ref=nb_ss_w_h_...rds=clay+blair
Link for the KL book.....another great read
http://www.amazon.com/U-Boat-Evoluti.../dp/0304361208
Thares a quaint story behind this one.....but I'm not telling