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- Corporate/Agency Authors:
- Signal Office
- Publisher:
- Signal Office
- Date:
- Jan. 25, 1940
- SuDoc number:
- W 42.13/1:P 87
- Corporate/Agency Authors:
- Signal Office
- Publisher:
- Signal Office
- Date:
- [June 20, 1939]
- SuDoc number:
- W 42.13/1:R 11/20