1. Adel Yale Public content 1951. 2011-12-12T21:26:31Z. 2022-03-29T20:39:22Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Iowa.
2. Aeromagnetic survey of the Oelwein and part of the Dubuque North 1:100,000 quadrangles, Wisconsin and Iowa [microform] Yale Public content 1999. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey. English. Public. Wisconsin and Iowa.
3. Aeromagnetic survey of the Richland Center and part of the Decorah 1:100,000 quadrangles, Wisconsin and Iowa [microform] Yale Public content 1999. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey. English. Public. Wisconsin and Iowa.
4. Afton Yale Public content 1953. 2011-12-12T21:26:31Z. 2022-03-29T20:39:22Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Iowa.
5. Albia Yale Public content 1929. 2011-12-12T21:26:31Z. 2022-03-29T20:39:22Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Iowa.
6. Amana Yale Public content 1889. 2011-12-12T21:26:31Z. 2022-03-29T20:39:22Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Iowa.
7. 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.
8. 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.
9. 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.
10. 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.