Each proposed rule required by section 553 of title 5, United States Code, or any other statute, and any similar document voluntarily issued by an agency shall include a statement of--
(a) The time, place, and nature of public rulemaking proceedings; and
(b) Reference to the authority under which the regulatory action is proposed. [37 FR 23614, Nov. 4, 1972, as amended at 54 FR 9683, Mar. 7, 1989]