----------------------------Original message---------------------------- Chris & MAPS-L: The 1:50,000 DMA topographic maps are useful since: 1. ... the USGS 1:62,500s has been discontinued and are somewhat dated (roads etc.), they serve as a fairly recent reference tool. 2. ... they provide a more-detailed and easily-read UTM grid. A multi-sheet index is available from DMA (maybe) which makes locating a desired sheet much easier than the one tiny one that most U.S. depsitory libraries received several years ago. The one that is unfortunately like the PAIGH 1:250,000 index. The sheet (and series) numbering follows the same as older AMS/DMA series. If you look at the "V" series and the AMS/DMA 1:250,000 U.S. Series, you will see that that there is an Eastern U.S./Western U.S. and many different indexes for the various states (or "V" series). That is why the numbering seems confusing. Jim Minton University of Tennessee [log in to unmask]