Land O'Lakes, Maryland and Virginia Milk Producers Cooperative Association, Lone Star Milk Producers, and Arkansas Dairy Cooperative Association Move Toward Unification Land O'Lakes, Inc., Maryland and Virginia Milk Producers Cooperative Association, Lone Star Milk Producers, Inc., and Arkansas Dairy Cooperative Association have signed letters of intent to develop a plan for merger, officials of the four cooperative organizations said today. A new Eastern Fluid Milk Marketing Division of Land O'Lakes would be created and would operate under the established Advantage Dairy Group identity.