Mail matter. Cost ascertainment: Instruction letter C, Record of copies, pieces, revenues, and weights of 2d-class matter mailed by publishers and news agents; July 1, 1940.
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Mail matter. Cost ascertainment: Instruction letter C, Record of copies, pieces, revenues, and weights of 2d-class matter mailed by publishers and news agents; July 1, 1940.
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Mail matter. Cost ascertainment: Instruction letter C, Record of copies, pieces, revenues, and weights of 2d-class matter mailed by publishers and news agents; July 1, 1940.