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File:C + P - Copy.jpg
Person Cato van Nederhasselt + , Paul Otlet +
Source https://www.youtube.com/watch?v=S4grwR6BDgQ&index=7&list=PLNdHAbf4xhom7YThcLcvO2jPWQiE7ZX9G  +
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.
20:52:51, 18 November 2015  +
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