11. Ames Yale Public content 1914. 2011-12-12T21:26:31Z. 2022-03-29T20:39:22Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Iowa.
12. Anamosa Yale Public content 1890. 2011-12-12T21:26:32Z. 2022-03-29T20:39:22Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Iowa.
13. Audubon Yale Public content 1958. 2011-12-12T21:26:32Z. 2022-03-29T20:39:22Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Iowa.
14. Bagley Yale Public content 1956. 2011-12-12T21:26:32Z. 2022-03-29T20:39:22Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Iowa.
15. Baldwin Yale Public content 1891. 2011-12-12T21:26:32Z. 2022-03-29T20:39:22Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Iowa.
16. Bedrock aquifers of Iowa, 2004 [cartographic material] Yale Public content 2004. 2019-09-04T15:22:06Z. 2019-09-07T21:35:15Z. Iowa. Department of Natural Resources. Geological Survey Bureau. Iowa Dept. of Natural Resources. English. cartographic image. Public. Iowa and Iowa.
17. Bedrock geologic map of Iowa, 1998 [cartographic material] Yale Public content 1998. 2019-09-04T15:19:45Z. 2019-09-07T21:35:16Z. Iowa. Department of Natural Resources. Geological Survey Bureau. Iowa Dept. of Natural Resources. English. cartographic image. Public. Iowa and Iowa.
18. Bedrock topography of central Iowa Yale Public content 1985. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; Denver, CO : For sale by Branch of Distribution, USGS. English. Public. Iowa.
19. Bedrock topography of east-central Iowa Yale Public content 1972. 2012-11-16T19:53:21Z. 2023-02-09T21:27:15Z. Hansen, Robert E. Dept. of the Interior, U.S. Geological Survey. English. Public. Iowa.
20. Bedrock topography of north-central Iowa [cartographic material] Yale Public content 1978. 2014-02-28T20:15:38Z. 2014-03-13T22:16:13Z. Hansen, Robert E. Dept. of the Interior, U.S. Geological Survey. English. Public. Iowa and U.S.