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'Hard to believe it’s over': The last days of an American dairy farm

Since 1970, more than 90 percent of all U.S. dairy farms have closed due to low milk prices and industry restructuring. Recently, a corporate decision by Walmart led to the shutdown of a three-generation family-run dairy farm in Kentucky. We followed the Coombs family as they're forced to sell off the last of their dairy cows and try to make sense of what's ahead.