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Old 09-01-2009, 09:32 AM
JKellyMap JKellyMap is offline
Join Date: Mar 2005
Location: Wisconsin
Posts: 8,467
I tend to use words/phrases like this as two words when an adverb ("I found out about this first hand"), and as one word when an adjective ("I have firsthand knowledge of this") -- not sure if that's common, or considered "correct".