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[–] qwop 1 point 0 points (+1|-1) ago  (edited ago)

If you want to follow the DDT rabbit hole, then this page has one of the best compilations of the DDT and polio timeline you will find:
http://harvoa.org/polio/pol_all.htm

And if you want to learn more about the whole history of polio, then this presentation is also excellent:

"Smoke, mirrors, and the disappearance of polio":
https://www.youtube.com/watch?v=Twch-T-n8Ns