Mail matter. Cost ascertainment: Instruction letter E [July 1, 1929], Weights, or number of sacks, of incoming mails from foreign countries and United States possessions.
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Mail matter. Cost ascertainment: Instruction letter E [July 1, 1929], Weights, or number of sacks, of incoming mails from foreign countries and United States possessions.
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Mail matter. Cost ascertainment: Instruction letter E [July 1, 1929], Weights, or number of sacks, of incoming mails from foreign countries and United States possessions.