| propagation | |
| gen. | propagación |
| agric. | multiplicación |
| biol. | reproducción; cría |
| comp., MS | propagación |
|
ionospheric : 100 phrase in 9 subjects |
| Acoustics | 1 |
| Communications | 22 |
| Earth sciences | 1 |
| Electronics | 38 |
| General | 1 |
| Life sciences | 9 |
| Radio | 25 |
| Sound recording | 1 |
| Technology | 2 |