The History of Flour Milling in Early AmericaSome mills have one pair of millstones for grinding corn and another pair for grinding flour and other grains Millers in the North and New England states often grind all grains on one pair of millstones The millstones are dressed or grooved with an in between dress In the South it is common for a mill to have two pairs of millstones It is the custom in the South that if the locals discover