For letters or letterpackages over 20 ounces, add 21 cents per half ounce or fraction.

(b) Weight limits. The weight limit for letters and letter packages to all countries except Canada is 4 pounds; for Canada, 60 pounds.

(c) Dimensions-(1) Maximum dimensions. Maximum length is 24 inches. Maximum length, breadth, and thickness combined is 36 inches. When sent in the form of a roll, the length (the maximum of which may not exceed 36 inches) plus twice the diameter may not exceed 42 inches.

(2) Minimum dimensions. The address side must measure at least 51⁄2 inches in

length and 31⁄2 inches in width. For articles in the form of a roll, the length may not be less than 4 inches, or the length plus twice the diameter may not be less than 634 inches. Articles having lesser dimensions are accepted on condition that a rectangular address tag with dimensions of not less than 4 by 234 inches is attached.

(d) Restrictions. Letters and letter packages may not contain current communications exchanged between persons other than the sender and the addressee or person living with them.

(e) Merchandise in letters-(1) Dutiable merchandise. Letters or letter packages may contain merchandise which is dutiable in the country of destination unless the country is unwilling to accept such mailings. If a country prohibits dutiable merchandise in letters, this is shown under Prohibitions in the country item in the appendix. The postal service is not able to inform customers whether or not any items are dutiable in other countries. When mailing articles which may be dutiable, senders must comply with the provisions concerning documentation shown in § 21.4.

(2) Nondutiable merchandise. Articles which the senders know are not dutiable may be mailed to countries which do not accept dutiable merchandise, but only at the risk of the senders. The U.S. Postal Service assumes no responsibility for the treatment which such articles may be given by the foreign postal or customs authorities. As the presence of the green label (Form 2976) mentioned in § 21.4(a) generally denotes dutiable contents, it should be omitted from letter-mail articles when the sender knows the contents are not dutiable.

(f) Endorsement. Senders should add the words Letter (lettre) on the address side of letters and letter packages which, because of their size or manner of preparation, may be mistaken for matter of another class.

(g) Preparation and addressing. See § 21.1.

[39 FR 27458, July 29, 1974] § 22.2

Post cards.

(a) Rates-(1) Surface. Canada and Mexico, 8 cents each. All other countries, 12 cents each.

(2) Airmail. Canada and Mexico, 11 cents each. All other countries, 18 cents each.

(3) Other rates. The letter rate (surface or air), or the surface printed matter rate if the card conforms to printed matter requirements, applies to cards exceeding 6 by 44 inches. Cards exceeding 6 by 44 inches are not mailable unless enclosed in envelopes.

(b) Dimensions. Maximum dimensions, 6 by 44 inches. Minimum dimensions, 52 by 31⁄2 inches.

NOTE: For Canada and Mexico postal and post cards measuring at least 51⁄2 by 34 inches are acceptable.

(c) Requirements—(1) Form and marking. Post cards shall be made of cardboard that meets the material and color specifications in § 131.2(a) (2) or of paper strong enough to withstand handling. Post cards of private manufacture must bear on the front the heading Post Card, although this is not obligatory for picture post cards.

(2) Preparation, addressing, and mailing. Post cards shall consist of a single card and are sent unenclosed, without wrapper or envelope. Folded cards must be mailed in envelopes. The right half, at least, of the address side of the card is reserved for the address of the addressee and the notations or labels relating to the service. The sender may use the back and the left half of the address side. Postage must appear on the address side, in the upper right corner of the card; otherwise, the card is treated as unprepaid. Undeliverable post cards are disposed of in the country of address unless they bear the name and address of the sender.

(3) Attachments. Do not join or attach samples of merchandise or similar articles to post cards. However, illustrations, photographs, stamps of any kind, labels, and clippings of any kind, of paper or other very thin material, as well as address labels or slips to be folded back, may be glued thereto, on condition that they do not alter the character of the post cards and that they adhere completely to the card. These articles may be glued only on the back or left half of the address side of the card, except address slips, tabs, or labels which may occupy the entire address side. Stamps of any kind, likely to be confused with postage stamps, may be placed only on the back.

(d) Reply-paid and folded cards. Reply-paid cards, as well as folded (double) cards are not accepted in international [37 FR 22582, Oct. 20, 1972, as amended at 39 FR 27458, July 29, 1974]

1 Weight limits in § 22.3(b) apply.

(ii) Books and sheet music. These consist of books, including books issued to supplement other books, of 24 pages or more, at least 22 of which are printed, consisting wholly of reading matter or scholarly bibliography or reading matter with incidental blank spaces for notations and containing no advertising other than incidental announcements of books, and printed sheet music. The surface rates are

(a) Argentina, Bolivia, Brazil, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Guatemala, Haiti, Republic of Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Uruguay and Venezuela:

(c) No separate rates are provided for nonprofit publications or for classroom publications. These second-class publications are subject to the rates stated in (a) and (b) above. Complete sample copies may also be mailed at those rates, whether or not the number of such sample copies exceeds 10 percent of the subscriber copies. Copies mailed by the public are subject to the regular printed matter rates stated in 23.3(a) (1) (i).

(iv) Controlled circulation publications. The rates on periodicals that are approved domestically as controlled circulation publications, when mailed by the publishers to all countries, are—

Lbs. Oz. Rate Lbs. Oz. Rate Lbs. Oz. Rate

$0.72 12.

$1.44

.96

.48 10.

1.20

0 2.. 0 4.....

Each additional 2 pounds or fraction (weights in § 22.3(b) apply)...

.69

34

1 Weight limits in § 22.3(b) apply.