National Water Conditions
U.S. Geological Survey
Environment Canada Climate Information Branch
JAN 1961
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FEB 1961
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MAR 1961
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APR 1961
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MAY 1961
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JUNE 1961
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JULY 1961
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AUG 1961
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SEP 1961
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OCT 1961
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NOV 1961
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DEC 1961
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