In July 2007 The Celator banned references to Wikipedia in articles. The magazine printed several letters to the editor commending him for the ban. I disagreed but did not write a letter.
Wikipedia is still free to discuss The Celator and now does thanks to an article I just created.
The Celator banned Wikipedia references because of errors in historical content. I've found Wikipedia to be a good start at information that I later check elsewhere. Rather than discussing Wikipedia's historical coverage I'd like to point out its numismatic coverage.
Wikipedia has always had articles on numismatic topics. It now has a Numismatics WikiProject and a Numismatics Portal. The portal is a 'face' that presents Wikipedia content organized for numismatic purposes. The project is an effort to coordinate folks improving numismatic articles and the portal. The 'current collaboration' is to improve the Ancient Greek Coinage article.
Wikipedia has almost no coverage of numismatic literature. There is a Numismatics Journals category with just seven entries. A few books, like The Red Book have Wikipedia entries but there is no 'Numismatic Book' category to gather them together.
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