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Clay

 * 1860-1918 U.S., Indexed County Land Ownership Maps, 1860-1918, Clay County at Ancestry ($) - index.
 * 1904-2007 Clay County 1904-2007 at Historic Map Works - may include names of land-owners.
 * 1893-1946 Fire Insurance Maps for Clay County, Iowa at Library of Congress - various years between 1893 and 1946.
 * Clay County Maps at FamilySearch Catalog.
 * IAGenWeb - Clay County.
 * Iowa Digital Library, Clay County at Iowa University Libraries.
 * (*); at FamilySearch Catalog — images.
 * The Iowa Heritage Digital Collections, Clay County at State Library of Iowa.
 * FamilySearch Places:Cities and Towns- How to Use FS Places.

Clayton

 * 1860-1918 U.S., Indexed County Land Ownership Maps, 1860-1918, Clay County at Ancestry ($) - index.
 * 1904-2007 Clay County 1904-2007 at Historic Map Works - may include names of land-owners.
 * 1893-1946 Fire Insurance Maps for Clay County, Iowa at Library of Congress - various years between 1893 and 1946.
 * Clay County Maps at FamilySearch Catalog.
 * IAGenWeb - Clay County.
 * Iowa Digital Library, Clay County at Iowa University Libraries.
 * The Iowa Heritage Digital Collections, Clay County at State Library of Iowa.