You searched for: Issue Dates May 1950 Remove constraint Issue Dates: May 1950 Product Keywords butter Remove constraint Product Keywords: butter Collections Foods, 1940-1966 Remove constraint Collections: Foods, 1940-1966 Titles 15264. Adulteration of butter. U. S. v. 7 Cases. Remove constraint Titles: 15264. Adulteration of butter. U. S. v. 7 Cases.