Except as otherwise provided in this subtitle or by a rule or regulation adopted under this subtitle, this subtitle and the rules and regulations adopted under this subtitle shall be interpreted in accordance with the Grade A Pasteurized Milk Ordinance. For all manufactured milk products and activities, this subtitle and the rules and regulations adopted under this subtitle shall be interpreted in accordance with Milk for Manufacturing Purposes and Its Production and Processing: Recommended Requirements. The Secretary shall keep on file a certified copy of the Grade A Pasteurized Milk Ordinance. The Secretary shall keep on file a certified copy of Milk for Manufacturing Purposes and Its Production and Processing: Recommended Requirements.