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Global atmospheric As and Bi contamination preserved in 3000 year old Arctic ice; Krachler, M; Zheng, J; Fisher, D; Shotyk,
W. Global Biogeochemical Cycles vol. 23, issue 3, GB3011, 2009 p. 1-7,
https://doi.org/10.1029/2009GB003471 
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Cont.# 20080598)