Secret and urgent; the story of codes and ciphers,
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| Author / Creator: | Pratt, Fletcher, 1897-1956 |
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| Imprint: | Indianapolis, New York, The Bobbs Merrill Co. [c1939] |
| Description: | 282 p. 25 cm. |
| Language: | English |
| Subject: | |
| Format: | Print Book |
| URL for this record: | http://pi.lib.uchicago.edu/1001/cat/bib/200270 |