who invented the plow
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who invented the plow
who invented the plow in ancient mesopotamia
who invented the plow in mesopotamia
who invented the steel plow
who invented the iron plow
who invented the riding plow
who invented the cast iron plow
who invented the steel moldboard plow
invented the steel plow
who invented the moldboard plow
who invented the steel tipped plow
who invented the plow, who invented the plow in ancient mesopotamia, who invented the plow in mesopotamia, who invented the steel plow, who invented the iron plow, who invented the riding plow, who invented the cast iron plow, who invented the steel moldboard plow, invented the steel plow, who invented the moldboard plow, who invented the steel tipped plow