People want something and then their purchases may be monitored by third party grading services, price guides, sellers of the item can report their sales too. Some of the really decent price guides that might have errors and/or varieties are not found too often. They highlight only higher priced varieties like the doubled die Lincoln cents of 1955, 1958, 1969S, 1972 orsomething like the 1943 copper and 1944 steel cent. Lets HOPE that now that Whitman publishing Publishing was bought out by David Lawrence Rare Coins that since those guy have been around for a long time, they might offer something on a regular basis for errors and varieties.
Some books are not updated on a schedule. It's best sometimes to research the same exact coin online and see what things have sold for. Asking price is nothing as people can ask the world for something that may be normal.
Some books may take years for the book to be written, edited and eventually made available to the public. The values may change drastically. Books are also one person's opinion on what that coin may be worth. Some of the prices could be outdated by the time the book is available. Some items you may never see that is described in the books.
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