USGS CoreFacts
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Episodes for water
126
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125
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118
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117
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113
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111
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110
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106
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103
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102
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99
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96
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92
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87
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84
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82
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77
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73
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72
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69
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57
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47
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37
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35
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23
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13
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6
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3
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2
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For previous episodes, look in the Tag Cloud/Archives on the right.