<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by kcvt750:
Never mind, found it.
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Actually, what you linked to above is mostly a subway map of Tokyo, not a JR map (although it does have a few JR lines on it).
Here is the JR Greater Tokyo map:
http://www.jreast.co.jp/e-info/map_a4ol.pdf