Entry as second class mail

§ 4352. Entry as second class mail (a) Upon application in the form prescribed by him the Postmaster General shall enter as second class mail, at the Post Office where the office of publication is maintained, any publication which is entitled under sections 4353–4357 of this title to be classified as second class mail. A publication entered at one post office may also upon application be entered by him at another post office. (b) The Postmaster General may revoke the entry of a publication as second class mail whenever he finds, after a hearing, that the publication is no longer entitled to be entered as second class mail. (c) The Postmaster General may not accept for mailing as second class mail any publication having more than 75 per centum advertising in more than one-half of its issues during any twelve-month period and he shall revoke its entry. A charge made solely for the publication of transportation schedules, fares, and related information is not considered as advertising under this subsection.