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Physics of the air / by W.J. Humphreys
- 551.5 H9271 1940
- Humphreys, W. J. 1862-1949.
- McGraw-Hill Book Co.,
- 1940.
- New York ; London :
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Principles of direct-current machines / by Alexander S. Langsdorf.
- 621.3132 L285 1940
- Langsdorf, Alexander S. 1877-1973.
- McGraw-Hill book company, inc.,
- 1940.
- New York ; London :