be drawn with the instrument in the time it takes to draw one vertically 
enlarged profile from a topographic map. It provides a means for 
drawing vertically enlarged profiles that show details of surface 
configuration for geologic interpretation. Exaggerated profiles may 
be constructed of most areas for which aerial photographs are available. 
Ground control or topographic map coverage is not necessarily required. 
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+ INT.DUP.,D.C.60- 74448