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| Category:Reference works |
| Modification date "Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by Semantic MediaWiki.
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23:49:43, 1 January 2012 + |
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| Subcategory of | Non-fiction books + , Book by content + |
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| Library of the Public Domain Project + | Categories |
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| Category:Encyclopedias + | Subcategory of |
