E
http://data.kansasgis.org/catalog/elevation/ned/demgrid_e.zip
EC
http://data.kansasgis.org/catalog/elevation/ned/demgrid_ec.zip
W
http://data.kansasgis.org/catalog/elevation/ned/demgrid_w.zip
WC
http://data.kansasgis.org/catalog/elevation/ned/demgrid_wc.zip