national map point selection (1) contour lisp (1)
  This routine creates 3D contour lines from 3D points.     It was written for Autocad 2000, so there's no   guarantee it will work in newer versions. It seems to work with no problem in Bricscad. ( hint, hint ). Click here for free trial --> Bricscad
This program writes comma separated (.csv) xyz point files from selected portions of 1 degree     National Elevation Database float files (.flt/.hdr).   If you still have DEM files, see below.
  These lisp routines draw a traverse based on     bearing, distance and curve input.  You can annotate     lines, insert curve data and insert area   quantities by picking any closed area.