تفاوت میان نسخه‌های «دانشنامه کلمبیا»

نجات ۲ منبع و علامت‌زدن ۰ به‌عنوان مرده.) #IABot (v2.0
(نجات ۲ منبع و علامت‌زدن ۰ به‌عنوان مرده.) #IABot (v2.0)
* [http://www.infoplease.com/encyclopedia.html Information Please], part of the Family Education Network—Site has banners
* [http://columbia.tfd.com/ The Free Dictionary] -- Site does not have any advertisements, but some content only available with a subscription
* [https://web.archive.org/web/20130808102515/http://education.yahoo.com/reference/encyclopedia/ Yahoo!] -- Site has a few banners.
* [https://web.archive.org/web/20110930183528/http://education.yahoo.com/reference/encyclopedia/frontmatter?id=3 Preface to the 6th edition] -- gives more information on the current edition of the Columbia Encyclopedia
 
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