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| I have looked as well and been unable to find anything. The Iowa state doesn't go very far back and Nebraska is 1960 to 2004. Until someone comes up with something else, I am not inclined to believe there has ever been a drop anywhere near this big. Think I have heard about a big drop in early seventies but can't find data to back it up.
 (1960 cattle.PNG)
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 1960 cattle.PNG (82KB - 145 downloads)
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looking for a chart
