Historia de riego agricola By RUIZ SUAREZ Period: 30,000 BCE to 40,000 BCE historia agricola jjddddddddddddddddddddddddddddd Period: 4000 BCE to 4000 BCE los suemerios sjdjjduwfudnwudnf 3000 BCE Historia de riego agricola hwhshhhhhhhhhhhhhhhhhhhhh