A good book on running - recommendations pls!

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Hello all,
I started running mid-2011 with C25K and now am getting a little more serious - have signed up for a 10K race in February and am planning to do a half marathon later in 2012. Can anyone recommend a good book on running - technique, speedwork, avoiding injury etc? So far I've managed not to injure myself but I figure if I'm increasing distance and running more then some expert guidance would be useful.
All suggestions gratefully received!
Many thanks,
Flab4

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