-------- Original Message --------
Subject: TPC, JNC editions
Date: Wed, 19 Jan 2005 14:54:59 -0500
From: Michael Fry <[log in to unmask]>
Organization: UMD Libraries
To: Maps and Air Photo Systems Forum <[log in to unmask]>

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We have what look like two versions of some TPC and JNC charts, but it's
not clear to me if I should
keep both. For example, we have TPC K-10CG (1975) and TPC K-10C (2001),
as well as JNC-7N (1975) and
JNC-7 (1998). Are these simply different editions of the same chart
(with slightly different names),
or substantively different charts?

Thank you.
mf
--
Michael Fry
Government Documents & Maps Librarian
University of Maryland Libraries