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PUBLIC LAW 86-682-8EPT. 2, 1960
[74 S T AT.
§ 4551. Definition Fourth class mail consists of mailable matter— (1) not mailed or required to be mailed as first class mail; (2) within the size and weight limits prescribed for fourth class mail; and (3) not entered as second class mail. § 4552. Size and weight limitations (a) Except as provided in subsection (b) of this section— (1) the maximum size of fourth class mail is seventy-two inches in girth and length combined, and (2) the minimum weight is sixteen ounces and the maximum forty pounds in the first and second zones and twenty pounds in any other zone. (b) The maximum size of fourth class mail is one hundred inches in girth and length combined and the minimum weight is sixteen ounces and the maximum seventy pounds for parcels— (1) mailed at, or addressed for delivery at, a second, third, or fourth class post office or on a rural or star route; (2) containing baby fowl, liveplants, trees, shrubs or agricultural commodities but not the manufactured products of those commodities; (3) consisting of books permanently bound for preservation consisting wholly of reading matter or reading matter with incidental blank spaces for students' notations and containing no advertising matter other than incidental announcements of books; (4) addressed to or mailed at an Army, Air Force, or Fleet post office; (5) addressed to or mailed in the Commonwealth of Puerto Eico, the Territory of Hawaii or a possession of the United States including the Canal Zone and the Trust Territory of the Pacific Islands; and (6) consisting of reproducers for sound reproduction records for the blind or parts thereof, and of Braille writers and other appliances for the blind or parts thereof, mailed under section 4654 of this title. § 4553. Postal zones (a) For the purposes of fourth class mail the United States, its possessions, the Territory of Hawaii and the Commonwealth of Puerto Kico are divided into units of area thirty minutes square, identical with a quarter of the area formed by the intersecting parallels of latitude and meridians of longitude, represented on postal maps or plans. ( D) The units of area are the basis of eight postal zones, as follows: (1) the first zone includes all territory within the quadrangle in conjunction with every contiguous quadrangle, representing an area having a mean radial distance of approximately fifty miles from the center of a given unit of area. (2) the second zone includes all units of area outside the first zone lying in whole or in part within a radius of approximately one hundred and fifty miles from the center of a given unit of area. (3) the third zone includes all units of area outside the second zone lying in whole or in part within a radius of approximately three hundred miles from the center of a given unit of area. (4) the fourth zone includes all units of area outside the third zone lying in whole or in part within a radius of approximately six hundred miles from the center of a given unit of area. (5) the fifth zone includes all units of area outside the fourth zone lying in whole or in part within a radius of approximately one thousand miles from the center of a given unit of area.
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