. . "Food and drugs"@en . . . . "Code of federal regulations. [Title] 21, parts 100 to 169, Food and drugs : revised as of April 1, 2000 containing a codification of documents of general applicability and future effect as of April 1, 2000 with ancillaries"@en . . . . "CFR 21, food and drugs"@en . . "Federal register"@en . . "Title 21, food and drugs"@en . . . . .