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ub|k ub|k
wrote...
Posts: 6621
6 years ago
As American cities developed, some city officials introduced filtration, which accounted for what percent of urban residents' water supply by the early twentieth century?
 
  a. 6 percent
  b. 26 percent
  c. 56 percent
  d. 96 percent
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doctorfededoctorfede
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Posts: 5317
6 years ago
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Good timing, thanks!
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