netbsd : books?

[Mayuresh Kathe <mayuresh%kathe.in@localhost>]

hello,

are there any books which are specific to netbsd?
i saw a 2 volume set called "netbsd system manager's manual" by jeremy c 
reed on amazon.com, but it is from june 2010, infact, over 4 years old.

isn't there anything newer?

thanks,

~mayuresh