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One possibility: Operation Plumbbob, a series of open air nuclear tests in 1957, generated considerable fallout in north central NE.

Project Sedan. https://en.wikipedia.org/wiki/Sedan_(nuclear_test)

That looks more probable for Iowa than NE. Still, great link! Never seen the before

any link to fallout maps? None are listed in the wikipedia

This report might be of use:

https://acsjournals.onlinelibrary.wiley.com/doi/10.3322/canj...

Very good article, thanks

Interesting location choice. Why central NE?

Family of a friend was involved with a cancer cluster near Grand Island. I think there is some environmental contamination of some sort, I know there are agg chemicals in the aquifer. Similar shockingly high numbers for a relatively small community.

Wisconsin.