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2
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The American magic : codes, ciphers, and the defeat of Japan / Ronald Lewin.
- 940.548673 L672
- Lewin, Ronald.
- Farrar Straus Giroux,
- c1982.
- New York :
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The other Ultra / Ronald Lewin.
- 940.5426 L672
- Lewin, Ronald.
- Hutchinson,
- 1982.
- London :