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·Once upon a time, only a decade or so, it wasnât hard to know where factory hog farms were because they were nearly all in North Carolina. But since those days, the practice of crowding together huge concentrations of animals â hogs, poultry, dairy cows, beef cattle â in the interests of supposed efficiency has spread around the country.
http://www.nytimes.com/2007/07/31/opinion/31tue4.html?th&emc=th
http://www.nytimes.com/2007/07/31/opinion/31tue4.html?th&emc=th