This section covers errors or omissions in different editions of reference books. These books have often been around in different editions for a long time; translated versions often differ from the originals, so some errors may or may not be found in your edition.
The number of errors does not indicate whether a book is good or not, it simply shows that you have to learn how to use the information it contains. The Danckert book, for example, contains much more text and goes through more history, so it is more prone to errors. Roentgen's books, on the other hand, are often considered useless because their content/error ratio is simply terrible.
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