Reddit reviews A Guidebook of United States Coins 2014: The Official Red Book (Official Red Book: A Guide Book of United States Coins)
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The Whitman Red Book, a price guide to US Coins.
Go back to Grandma's and make sure she doesn't have an 1893-S Morgan (or arm yourself with a Red book and do a quick lookup of all her coins.) It could be the difference between having some silver worth melt value and having a coin that you could trade for a nice used car!
http://www.amazon.com/gp/aw/d/0794841805?pc_redir=1411127300&robot_redir=1 this is the book I always have on hand when I roll hunt to look for key dates.