This USGS Digital Line Graphic map uses corresponding latitude and longitude to plot elevation. A map like this one could be used in a variety of ways.
(http://images.google.com/imgres?imgurl=http://weather.unisys.com/usgs/usgs-US.gif&imgrefurl=http://weather.unisys.com/usgs/index.html&usg=__wjsHc6T3NvNLgMLLzUDk17RAAic=&h=512&w=768&sz=140&hl=en&start=8&um=1&itbs=1&tbnid=J9wS5eA_46E3pM:&tbnh=95&tbnw=142&prev=/images%3Fq%3DThis%2BUSGS%2BDigital%2BLine%2BGraphic%2Bmap%26um%3D1%26hl%3Den%26client%3Dfirefox-a%26sa%3DN%26rls%3Dorg.mozilla:en-US:official%26tbs%3Disch:1)
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