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Significados de third-class mail en inglés

Mail consisting of printed matter qualifying for reduced postal rates.

Uso de third-class mail en inglés
1
Allowing these package humpers to carry first- and third-class mail would make this "suburban tax" disappear.
Wired
2
The technology is akin to bringing the First-, Second-, and Third-Class Mail system of the US Postal Service to the Internet.
Wired