When evaluating potential geology books, people may also want to think about the date of publication and the dates of any revisions. While geology is not necessarily a rapidly evolving field, people are always discovering new information, and once widely-accepted ideas in geology may not be as popular today. A book published in the last 20 years, for example, can generally be a good source, while geology books published 100 years ago may be more interesting as historical curiosities.
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