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REFERENCES <br /> ' United States Geological Survey (USGS), USGS Professional Paper 1270 for the <br /> Conterminous United States, updated April 28, 1992 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> s' I <br /> i <br /> S W w5i t"SA dac g <br /> • <br /> SIKTH <br />