Christopher C. Mathewson, Donald P. Piper; Mapping the physical environment in economic terms. Geology ; 3 (11): 627–629. doi: https://doi.org/10.1130/0091-7613(1975)3<627:MTPEIE>2.0.CO;2
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A value, based on costs and risks associated with geologic factors, can be established for tracts of land. When displayed on a map, these factors will be expressed in terms of economic value. The map is a “high-low” land-value map that identifies land having high costs and risks as low-value land and land having low costs and risks as high-value land.