The principles of sound signalling,
Wedi'i Gadw mewn:
| OCLC: | 7779775 |
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| Prif Awdur: | |
| Awduron Eraill: | |
| Iaith: | English |
| Cyhoeddwyd: |
New York,
D. Van Nostrand,
1925.
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| Pynciau: | |
| Fformat: | Monograph Note that CRL will digitize material from the collection when copyright allows. |
| Disgrifiad Corfforoll: | 4 p. ̋., 139, [1] p. diagrs. 23 cm. |
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