December November October September August July June May april March February 1958 January Period Sampling gota Columbia, Bo # 0201 0.03 2 0-01 2 0.02 *% 0402 1ye38 2 0627 3.75 * 063 yedl 2 0032 18.4 % 0-6 eo 2 Oolt 2.66 * 0.04 1055 % 0-10 0.82 2 0029 Oe X 0-0 0058 2 042 Oks 2 Oot gr99 8.27 * 0205 572 2 Oelsd 3,01 2 0L9 9637 2 0069 wi8 April 159 rst week started fi sample not 9.10 0009 * 0602 0.06 0.20 % 0.02 0.10 0.02 Oel2 0.025 + 0.0 0.04 2% 0-02 0.12 2 0.02 0.0 7 0-01 gr90 mile per square millicuries eriod of_esmplt at_midpoint t 2 0.26 2 0-02 Oly * 0.02 hy yié 1 Te 92 L3 133 3 204 + 165 Bl 2 1-3 227 why 1.6 2.89 1.79 0.61 0.35 es ppt'ne chhes_. no _iin 0.98 # 0-15 «| «(0688 * 0013 0679 % 0013 0073 * 0-12 0053 2 0610 Oel3 % 9-03 Oelsl * 040% 96 wi 0.10 2 0.02 mo sr90. 33 W901 % Leb . on 6-12-58 gr 10 0.29 2 0-03 «1 mie on 6-1-58 w Wi hk 15 12 widpoint at Sampling gr°9/sr?° ONS. OUL COLLECTI MONTHLY, FALL e e e (gue eee

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