Looking for a Dirac book on qft

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I just happily bought a used copy of Dirac's Lectures on Quantum Mechanics from Amazon.com. I also want his Lectures on Quantum Field Theory but they don't carry it. Anyone know where I can find a copy?
 
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Thanks. :)

Wait, 80 bucks? Holy crap.
 
Wow, I didn't know Dirac wrote a book on QFT. :)
 

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