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TABLE 2. Key for map symbols in Figs. 4a, 4b, 9a, and 9b. <br />Map Proxy data Proxy <br />letter Reference source variable Location <br />A Stockton and Meko (1983) Tree rings Precipitation Four regions flanking Great Plains <br />C Fritts (1983) <br />E Blasing and Duvick (1984) <br />G Stahle and Cleaveland (1988) <br />I Haston and Michaelsen (1997) <br />} [tt�neceast�t r,rnrnracnxfv <br />K Hughes and Brown (1992) <br />Tree rings <br />Tree rings <br />Tree rings <br />Tree rings <br />Tree rings <br />Precipitation Central plains <br />Precipitation Western corn belt <br />Drought North and south TX <br />Precipitation South CA <br />Drought <br />Central CA <br />M D'Arrigo and Jacoby (1991, 1992) Tree rings Precipitation Northwest NM <br />� � � Grt_ssvto��f�'ayer �i99 � 'free Tangs - �°Precipitaitong`, _ ortl��e��� �r <br />O see Dean (1994) Tree rings Precipitation South CO Plateau <br />Q Lehmer (1970), Wendland (1978) Archaeological Drought <br />remains <br />107 Fn a �9� 1} +` = ake se�unents kSaluil. <br />S Laird et al. (1996), Laird et al. (1998) Lake sediments Salinity <br />'� �D�e� et<akt��I994), beait;(I�)- ' ake se'd�ments�� ndtty <br />U Muhs and Holliday (1995) and others Eolian sediments Drought <br />Missouri Valley <br />Moon Lake, ND <br />Western Great Plains <br />W Stine (1994) Flooded stumps Lake levels Sierra Nevada, CA- <br />2700 Vol. 79, No. 12, December 1998 <br />