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- Corporate/Agency Authors:
- Coast and Geodetic Survey and Commerce Department
- Publisher:
- Coast and Geodetic Survey
- Date:
- May 1941
- SuDoc number:
- C 4.3:4421
- Corporate/Agency Authors:
- Radio Division and Commerce Department
- Publisher:
- Radio Division
- Date:
- [1931.]
- SuDoc number:
- C 4.3:165