Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 102 C. E. VAN ORSTRAND ^i^ -2^^^ 9 '§ *â Oft w '^ '** â â¢â * 1 w h-l 9 8^ 1 ° *. o 9 ? o ^ co OOi^fO « t^OO t-~ 10 O O M M \OvO1010O 00 00 9 covO Tf O M n h n « « WHWNM M N Tf O toio^n \Q t^oo OO O w 00 C>vO O N't t~» ^J-00 O>00 M O>0 OOO vO O »o O co m O O tON o O '*â â **â O O* NO\MfltN ^±- O w M « W l-l O co O Q O O O >0 5 O W Pt M H N t B t« «)« III I I I I o t-» I I to I N «)Mot O 'O co o o \J *7 *-* ^> 'l-l 00 I h o o> â


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