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- Corporate/Agency Authors:
- United States Postal Service
- Publisher:
- United States Postal Service
- Date:
- Aug. 1970
- SuDoc number:
- P 1.31/3:10/2
- Corporate/Agency Authors:
- Post Office Department
- Publisher:
- Post Office Department
- Date:
- Dec. 1, 1969
- SuDoc number:
- P 1.31/3:14/3/trans.20
- Corporate/Agency Authors:
- Post Office Department
- Publisher:
- Post Office Department
- Date:
- [Revised edition.] Sept. 1969
- SuDoc number:
- P 1.31/3:3/2