For any area that might be in the National Park System (and
the Truman home is a National Historic Site), go to the NPS
Web site <www.nps.gov> and you can either locate it by name
(I think the official name is 'Harry S. Truman NHS) or by
state on a clickable map.

I think there is also a Truman library, but I'm not sure. My
recollection is that the presidential libraries are all under GSA,
so a trip to their Web site might turn up another lead.

Hope this helps,
Tom
--
Tom Vaughan    "The Waggin' Tongue"
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11795 Road 39.2, Mancos, CO 81328  USA
Cultural Resource Management, Interpretation, Planning, & Training