1961. 2002-11-05T14:41:54Z. 2016-11-29T22:11:23Z. United States. Bureau of the Census. The Bureau. English. Public. Iowa.
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2. Mason City
1961. 2011-12-12T21:26:36Z. 2022-03-29T20:39:22Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Iowa.
