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21. Mail matter. Cost ascertainment: Instruction letter M, Record of pieces and weight of originating free mails; July 1, 1943.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1943.]
SuDoc number:: P 4.5:M/2

22. Mail matter. Cost ascertainment; Instruction letter F, Time studies and expenditures, 1stand 2d-class post offices; July 1, 1943.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1943.]
SuDoc number:: P 4.5:F/23

23. Cost ascertainment: Instruction letter F, Time studies and expenditures, 1stand 2d-class post offices; July 1, 1942.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1942.]
SuDoc number:: P 4.5:F/22

24. Cost ascertainment: Instruction letter F, Time studies and expenditures, 1stand 2d-class post offices; July 1, 1941.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1941.]
SuDoc number:: P 4.5:F/21

25. Mail matter. Cost ascertainment: Instruction letter H, Tests in city delivery service; July 1, 1941.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1941.]
SuDoc number:: P 4.5:H/17

26. Mail matter. Cost ascertainment: Instruction letter L, Measurement and apportionment of floor space; July 1, 1941.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1941.]
SuDoc number:: P 4.5:L/14

27. Mail matter. Cost ascertainment: Instruction letter A-a, Weight-piece-revenue tests, 3d-class merchandise and 4th class; July 1, 1940.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1940.]
SuDoc number:: P 4.5:A-a/15

28. Mail matter. Cost ascertainment: Instruction letter A-c [July 1, 1940], Revenue, pieces, and weights of book mailings.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: 1940
SuDoc number:: P 4.5:A-c

29. 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.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1940.]
SuDoc number:: P 4.5:C/16

30. Mail matter. Cost ascertainment: Instruction letter C-a, Consolidation of data for copies, pieces, revenues, and weights of publishers' 2d-class; July 1, 1940.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1940.]
SuDoc number:: P 4.5:C-a/6

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