Re: Is there a lot of difference between 3rd and 4th edition 7CSFAP?
I regret not having gotten the 21st Century edition of 7CS4AP (and HEP4AP for that matter) sooner than I did. There is a lot of new material. They could have done a better job with the editing, but you really need the newest edition. Buy a second book to get you up to $25.
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