| 001 | 690020 | |
| 003 | IlJaBTS | |
| 005 | 20240703053022.0 | |
| 008 | 240703s2024 nyu eng | |
| 020 | a|9781098293147 (temp) | |
| 100 | 1 | a|Olson, Elsie |
| 245 | 1 | a|Spy Communication |
| 300 | a|64 p. : b|ill. ; | |
| 490 | a|Spy Guide | |
| 520 | # | a|Learn how spies used covert communication techniques such as secret codes, invisible ink, and tiny cameras to pass intelligence to their handlers. Real-life spies and missions are explored. Readers can also try making their own invisible ink, dead drops, and secret codes. |
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