Drawing Contour Plots (http://avc.comm.nsdlib.org/cgi-bin/wiki_print.pl?Drawing_Contour_Plots). A lesson plan that deals with drawing various isopleths including isobars.
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... only to be replaced two years later by "SOS."
February 7 - A fire in Baltimore, Maryland destroys over 1,500 buildings in 30 hours.
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