Mail matter. Cost ascertainment: Instruction letter A, Record of revenues, pieces, and weights of revenue-producing originating mail matter; July 1, 1944.
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Mail matter. Cost ascertainment: Instruction letter A, Record of revenues, pieces, and weights of revenue-producing originating mail matter; July 1, 1944.
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Mail matter. Cost ascertainment: Instruction letter A, Record of revenues, pieces, and weights of revenue-producing originating mail matter; July 1, 1944.