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6411. Mail matter. Cost ascertainment: Instruction letter I [July 1, 1928]. 3d and 4th class post offices.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1928.]
SuDoc number:: P 4.5:I/4

6412. Mail matter. Cost ascertainment: Instruction letter K [July 1, 1928], Rural delivery service.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1928.]
SuDoc number:: P 4.5:K/3

6413. Mail matter. Cost ascertainment: Instruction letter L [July 1, 1928], Measurement and apportionment of floor space [at post offices, including stations and branch offices].

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1928]
SuDoc number:: P 4.5:L

6414. Mail matter. Cost ascertainment: Instruction letter R [July 1, 1928]. Railway Mail Service distribution and tests.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1928.]
SuDoc number:: P 4.5:R/6

6415. Mail matter. Cost ascertainment: Instruction letter T [July 1, 1928], Large terminal R. P. O. time reports and tests.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1928.]
SuDoc number:: P 4.5:T/3

6416. Mail matter. Cost ascertainment: Instruction letter U [July 1, 1928], Record of revenues by classes on drop mails and station letter-box collections by Railway Mail Service.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1928.]
SuDoc number:: P 4.5:U/3

6417. Mail matter. Cost ascertainment: Instruction letter V [July 1, 1928]. Railway Mail Service volume tests.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1928.]
SuDoc number:: P 4.5:V/3

6418. Mail matter. Cost ascertainment: Instruction letter W [July 1, 1928], Number of sacks of incoming mails from foreign countries and United States possessions.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1928.]
SuDoc number:: P 4.5:W/3

6419. Mail matter. Cost ascertainment: Instruction letter Y [July 1, 1928], Record of space used for distribution and storage purposes in R. P. O. and apartment R. P. O. cars.

Corporate/Agency Authors:: Post Office Department
Publisher:: Post Office Department
Date:: [1928.]
SuDoc number:: P 4.5:Y/3

6420. Mail-trains. Schedule of mail trains no. 467, June 19, 1928, 3d division, Railway Mail Service, comprising District of Columbia, Maryland, North Carolina, Virginia, and West Virginia (except peninsula of Maryland and Virginia).

Corporate/Agency Authors:: Railway Mail Service and Post Office Department
Publisher:: Railway Mail Service
Date:: 1928
SuDoc number:: P 10.12/3:467

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