There is a variant for Eberron on the wizards website, which is that knowledge:local applies to one region per rank spent. You can find the article here. http://www.wizards.com/default.asp?x=dnd/ebds/20040830a
This is the version I use, and it works quite nicely.
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gnfnrf
This is the version I use, and it works quite nicely.
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gnfnrf