United States Code, 2012 edition. Supplement 2 : containing the general and permanent laws of the United States enacted through the 113th Congress, January 3, 2013, to January 5, 2015 / prepared and published under authority of Title 2, U. S. Code, Section 285b, by the Office of the Law Revision Counsel of the House of Representatives. Vol. 2 : Title 21 — Food and drugs to Title 42 — The public health and welfare