--- Begin Forwarded Message ---
Date: Thu, 12 Apr 2001 21:19:14 -0400 (Eastern Daylight Time)
From: Mark Thomas <[log in to unmask]>
Subject: Re: 1:250K Topographic Map Question <fwd>
Sender: Mark Thomas <[log in to unmask]>



Date: Wed, 11 Apr 2001 10:22:04 -0700
From: Garnett S Campbell <[log in to unmask]>
Subject: 1:250K Topographic Map Question

> I am working on a project which requires the 6 character code with
> appears in the upper right
>   corner of the USGS 1:250K topographic maps.  I have been unable to find
> a listing of these
>   codes.  My understanding was that they were military assigned but
> looking both at USGS and
>   the National Imagery and Mapping agency has done no good.

This is the designation from the DMA/AMS Series 1501 (Joint
Operations Graphic) maps, and before that, numerous AMS
alpha-numeric regional series at 1:250,000.  It's just the
International Map of the World 1:1,000,000 designation divided
into 16 smaller units.  If you can't find the 1:250K index, you
might be able to find an AMS/DMA index for Series 1301 (1:1
million, covering the world). The 1:250,000 maps are laid out
within each 1:1 million quad like this:

 1   2   3   4
 5   6   7   8
 9  10  11  12
13  14  15  16

You're going to need to go to a big map collection to look for
one of these indexes. I don't know if any table, paper or
electronic, that correlates the alpha-numeric code with the
sheet name (except for the backs of some of the old AMS indexes
for some of their regional series). Maybe someone else does.

Email me off-list if you have more specific questions or needs,
since I'm not completely sure what you need.

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Mark Thomas / [log in to unmask] / 919-660-5853, fax:919-684-2855
Map and GIS Librarian / Economics Bibliographer
Public Documents and Maps Department
025 Perkins Library / Duke University, Durham, NC 27708-0177

--- End Forwarded Message ---