 |
| |||
| primary sources (Published and unpublished records without secondary interpretation or commentary) | |||
| original sources; primary literature | |||
| |||
| primary radiator | |||
| aerial feed; antenna feed | |||
|
sources primaires : 8 do fraz, 4 tematyki |
| Finanse | 1 |
| Komunikacja | 3 |
| Nauka o ziemi | 2 |
| Przemysł energetyczny | 2 |