You can buy books that are coin related errors but you will be spending a small fortune on the books.
My suggestion is to either buy the books on sale or if you could, review it in a book store prior to buying it. Here some books on coin errors that I have not rated because I have not read it.
-100 Greatest Error Coins
-The Laymans Guide To Error Coins
-The MoneyBucks Handbook: For Minting Errors & Die Varieties
-The Official Price Guide to Mint Errors
-How error coins are made in the U.S. Mints
-The error collector's handbook
-Cherrypicker's Guide to Rare Die Varieties of United States Coins
-Error Coins from A to Z: Alphabetical Listings with Prices
-The modern minting process and U.S. minting errors and varieties
-United States major and minor mint error types
-Longacre's two cent piece die varieties & errors
Error coins generally divided into PDS system which stands for Planchet, Die, and Strike.
What this means is that coin has to qualify in one of these categories to be considered an error.
Planchet simply means a blank surface on what coin is struck on. Die means the stamp which is
used to strike the coin. There are 2 dies, the upper die and the lower die which creates and obverse and reverse face of the coin. So Keep this in mind, 3 systems:
1. Planchet Errors
All Planchet Errors are errors happening prior to entering press machine. These errors generally are worth a pretty penny. For example, 1965 Dime and Quarter Silver Planchet error is a prime example of this kind of error. U.S. Mint created few Dimes and Quarters minted on Silver Planchets. All 1965 Dimes and Quarters should be minted on Clad planchet. The easiest way to know if your coin is a Planchet Error is to weigh the coin.
2. Die Errors
Die Errors are any errors occurring after being fed into press machine. This is where you get your variety collection, Double Die Deterioration, Die Blistering, and so on. Most of the die errors are generally worth less. To be able to distinguish the differences between Die Errors, you have to have a good eye and keen sense of detection. Some of Die Errors are very similar with differences in price into hundreds of dollars. One prime example would be Strike Doubling and Double Die, where both coins almost look the say but one is worth less and the other a pretty penny.
3. Strike Errors
Strike Errors are errors occurring when the Planchet and the press meet. These errors usually come into misshaped coins. Best example of this kind of error is off centered coins with half of the coin blank and the other half image of the coin. These errors aremoderate in price and collecting these coins are fairly easy.
Although error coins would sell much more than their face value, they are not what you would want for an investment. They are fun to detect and collect but not to investment. The reason for this is the demand for error coins are lot less than regular coins. Keep in mind; if you are an expert in collecting error coins, you are a Numismatist. Not only an error coin expert has to identify the coin to be an error but also be able to grade the coin. These two simple factors not only makes the error coin expert the best expert in the business but also gives him or her a unique ability which is not present in regular coin experts. I collect errors because U.S. Mint does an outstanding job catching these errors before it hits the circulation. I have not been able to detect a Double Die yet, and I have searched through more than 50,000 coins in different denominations. So, with that said, think how lucky you would be if you can spot one of these beauties in a roll.
These are some examples that includes none collectables and collectables. I have fetched through bank roll to be able to find these. Please click on the pictures to get more info