Mail matter. Cost ascertainment: Instruction letter C [July 1, 1929], Record of copies, pieces, revenues, and weights of 2d-class matter mailed by publishers and news agents.
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Mail matter. Cost ascertainment: Instruction letter C [July 1, 1929], Record of copies, pieces, revenues, and weights of 2d-class matter mailed by publishers and news agents.
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Mail matter. Cost ascertainment: Instruction letter C [July 1, 1929], Record of copies, pieces, revenues, and weights of 2d-class matter mailed by publishers and news agents.