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- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- July 28, 1931
- SuDoc number:
- C 21.5/a 2:408/4
- Corporate/Agency Authors:
- Mines Bureau and Commerce Department
- Publisher:
- Mines Bureau
- Date:
- July 27, 1931
- SuDoc number:
- C 22.8/a:C 177/930
- Corporate/Agency Authors:
- Mines Bureau and Commerce Department
- Publisher:
- Mines Bureau
- Date:
- July 27, 1931
- SuDoc number:
- C 22.8/a:G 563/7/929
- Corporate/Agency Authors:
- Mines Bureau and Commerce Department
- Publisher:
- Mines Bureau
- Date:
- July 24, 1931
- SuDoc number:
- C 22.8/a:F 673/930
- Corporate/Agency Authors:
- Mines Bureau and Commerce Department
- Publisher:
- Mines Bureau
- Date:
- July 23, 1931
- SuDoc number:
- C 22.8/a:G 563/9/929
- Corporate/Agency Authors:
- Patent Office and Commerce Department
- Publisher:
- Patent Office
- Date:
- July 21, 1931
- SuDoc number:
- C 21.5/a 2:408/3
- Corporate/Agency Authors:
- Standards Bureau and Commerce Department
- Publisher:
- Standards Bureau
- Date:
- July 16, 1931
- SuDoc number:
- C 13.12/1:121
- Corporate/Agency Authors:
- Standards Bureau and Commerce Department
- Publisher:
- Standards Bureau
- Date:
- July 16, 1931
- SuDoc number:
- C 13.4:393
- Corporate/Agency Authors:
- Standards Bureau and Commerce Department
- Publisher:
- Standards Bureau
- Date:
- July 15, 1931
- SuDoc number:
- C 13.20:28
- Corporate/Agency Authors:
- Census Bureau and Commerce Department
- Publisher:
- Census Bureau
- Date:
- July 14, 1931
- SuDoc number:
- C 3.21:930-931/11