When searching rolls what coins to keep?

I have only really ever searched half dollars and I just know to keep the silver ones dated 1970 and earlier but what other coins are good to keep?
Is there a list for each demonination?

 

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this is the best beginners advice i have found on the net http://forums.wheresgeorge.com/showthread.php?t=68593

 

Yea, I agree. That sums up alot of roll searching etc. Nice.