 |
| |||
| primary sources (Published and unpublished records without secondary interpretation or commentary) | |||
| original sources; primary literature | |||
| |||
| primary radiator | |||
| aerial feed; antenna feed | |||
|
sources primaires : 8 фраз в 4 тематиках |
| Землеведение | 2 |
| Связь | 3 |
| Финансы | 1 |
| Энергетика | 2 |