EX:1
https://pubs.usgs.gov/of/2009/1103/ofr20091103.pdf
https://lib.dr.iastate.edu/cgi/viewcontent.cgi?referer=https://www.google.com/&httpsredir=1&article=12418&context=rtd
https://lib.dr.iastate.edu/cgi/viewcontent.cgi?referer=https://www.google.com/&httpsredir=1&article=12418&context=rtd
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