| 001 | P1022100 P10221 | |
| 003 | IlJaBTS | |
| 005 | 20250207112004.0 | |
| 006 | m cq h | |
| 007 | cz nza---ancau | |
| 007 | sz zunznnnzneu | |
| 008 | 250207r20242024ohunnnncq f n eng d | |
| 020 | a|9798822687004 (sound recording) | |
| 028 | 1 | a|46113 b|Playaway |
| 040 | a|IlJaBTS c|IlJaBTS d|IlJaBTS | |
| 082 | 4 | a|[Fic] 2|23/eng/20250106 |
| 100 | 1 | a|Sepetys, Ruta. |
| 245 | 14 | a|The Bletchley riddle h|[electronic resource] / c|Ruta Sepetys and Steve Sheinkin. |
| 250 | a|Unabridged. | |
| 260 | a|Solon, Ohio : b|Playaway, c|[2024] | |
| 300 | a|1 sound media player (9 hr., 30 min.) : b|digital, HD audio ; c|3 3/8 x 2 1/8 in. | |
| 500 | a|Issued on Playaway, a dedicated audio media player. | |
| 500 | a|Title from Playaway label. | |
| 500 | a|Release date supplied by publisher. | |
| 500 | a|Previously released by Penguin Random House. | |
| 500 | a|One set of earphones and one AAA battery required for listening. | |
| 520 | a|Follow two siblings at Bletchley Park, the home of WWII codebreakers, as they try to unravel a mystery surrounding their mother's death. | |
| 521 | 1 | a|010-014. b|BTSB. |
| 650 | 7 | a|Siblings v|Fiction. 2|sears |
| 650 | 7 | a|Ciphers v|Fiction. 2|sears |
| 650 | 7 | a|Missing persons v|Fiction. 2|sears |
| 650 | 7 | a|World War, 1939-1945 v|Fiction. 2|sears |
| 650 | 1 | a|Siblings v|Fiction. |
| 650 | 1 | a|Ciphers v|Fiction. |
| 650 | 1 | a|Missing persons v|Fiction. |
| 650 | 1 | a|World War, 1939-1945 v|Fiction. |
| 651 | 7 | a|Great Britian x|History y|1925-1953 v|Fiction. 2|sears |
| 651 | 1 | a|Great Britian x|History y|1925-1953 v|Fiction. |
| 710 | 2 | a|Playaway Digital Audio. |
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