Provides a simple discussion of sound waves, frequencies, and the uses of radar and sonar.
| hid | mid | miid | nid | wid | location_code | location | barcode | callnum | dewey | created | updated |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3281391 | 6684587 | 1577 | 388212 | 542953 | 35 | 379 | T 3501358 | SP 534 COO | 534 | 1640729255 | 1640729255 |