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Head Retention

65 bytes added, 13:32, 22 July 2013
Adding reference link
==External Links==
* [http://en.wikipedia.org/wiki/Guinness Guiness Stout on Wikipedia]
* [http://www.lbbrew.com/beer-on-nitro/ Beer On Nitro Explained]
[[Category:Technical]]
[[Category:Glossary]]
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