62 STAT.] 80TH CONG. , 2D SESS. -CH. 658-JUNE 25, 1948 sealed or unsealed, including written matter, shall, if such matter does not exceed the limit of weight or size prescribed for fourth-class matter, be accepted for mailing upon the payment of postage at fourth- class rates. (b) Shipments of official matter shall be sent by the most economical means of transportation practicable, and the Postmaster General may refuse to accept any such matter for shipment by mail when in his judgment it is in the public interest that it be forwarded by other means at less expense. SEC. 305. All executive departments and agencies, all independent establishments of the Government, and all other organizations and persons authorized by law to use the penalty privilege, are directed to supply as soon as practicable, all necessary information requested by the Post Office Department to carry out the provisions of this Act. SEc. 306. No executive department or independent establishment of the Government shall transmit through the mail, free of postage, any book, report, periodical, bulletin, pamphlet, list, or other article or document (except official letter correspondence, including such enclosures as are reasonably related to the subject matter of the cor- respondence; informational releases in connection with the decennial census of the United States, mail concerning the sale of Government securities, and all forms and blanks and copies of statutes, rules, regu- lations, and instructions and administrative orders and interpretations necessary in the administration of such departments and establish- ments), unless a request therefor has been previously received by such department or independent establishment; or such transmission is required by law; or such document is transmitted to inform the recip- ient thereof of the adoption, amendment, or interpretation of a statute, rule, regulation, or order to which he is subject. The head of each independent establishment and executive department (other than the Post Office Department) shall certify to the Postmaster General at the end of each quarter that nothing was transmitted through the mail free of postage by the independent establishment or department in violation of the provisions of this section: Provided, That nothing herein shall be construed to prohibit the mailing free of postage of lists of agricultural bulletins, lists of public documents which are offered for sale by the Superintendent of Public Documents, or of announcements of publications of maps, atlases, statistical, and other reports offered for sale by the Federal Power Commission as author- ized by section 825k of title 16 U. S . C .: Provided further, That this prohibition shall not apply to the transmission of such books, reports, periodicals, bulletins, pamphlets, lists, articles or documents to educa- tional institutions or public libraries, or to Federal, State, or other public authorities. SEC. 307. Section 6 of the Act of May 6, 1939 (53 Stat. 683), as amended, and Public Law 364 approved June 28, 1944, are hereby repealed. SEC. 308. There are authorized to be appropriated such sums as may be necessary to carry out the provisions of this Act. SEC. 309. This title shall take effect July 1, 1948, and may be cited as the "Penalty Mail Act of 1948". 1049 Transportation of official matter. Information to be supplied. Restriction on use of penalty privilege. Agricultural bulle- tills, etc. 49 Stat. 859. Nonapplicability. 39 U. S. C. §321b; Supp. I, § 321b note. 58 Stat. 394. 39 U. S. C. §§321- 321h; Supp. I, i 321g note. Appropriation au- thorized. Citation of title. TITLE IV-GENERAL PROVISIONS SEC. 401. The Secretary of Defense is authorized and directed, when- Incorporationti otR negotiation Act of 1948 ever in his judgment the best interests of the United States so require, incontracts. to direct the insertion of a clause incorporating the Renegotiation Act of 1948 in any contracts for the procurement of ships, aircraft, Af *. . -2 . aircraft parts, and the construction of facilities or installations outside
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