Grading Franklins?

Anybody know of a good book for grading Franklins or what to look for in grading coins. I have no idea at all on grading coins. All the coins i've purchased already have been certified. I purchased a book off of E-bay recently that was complete junk, all it said was look for marks here and there. Gave no pictures on this is a 63 because or this is a 64 because. I'm more confused now than before. Any help is appreciated.
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Also, google 'grading franklin half dollars'.............Rick
EBAY Items
http://search.ebay.com/_W0QQsassZrlamir
<< <i>Don't know if this will help you, but it's a start.......
Link
Also, google 'grading franklin half dollars'.............Rick >>
Thanks, that one page shows more than the few pages the book I bought did.
EBAY Items
http://search.ebay.com/_W0QQsassZrlamir