What I'd really like (and maybe I'm just confused or want too much) is the individual map promised by SDTS.  Full scale DEMs are usually too big (in land coverage, usually 1:250,000). I'd like to narrow down the size, or at least, get a resolution that I can crop and still get a quality terrain.

Now, the USGS has 1:24,000 DEMs in SDTS format, but I can't get them to work??