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- Ioan Ianov (1836 -1903) 1
- Ioan Nicorici collection 1
- iodine deficiency 1
- ioni 1
- ioni ai metalelor 1
- Ioniţă Mircea(1941-2002) 3
- ionograms 1
- ionosfera terestră 1
- Ionosferă 1
- ionosferă 7
- ionosonde 2
- ionosonde of type MLF 1
- ionosondes 1
- ionosphere 4
- ionospheric layer 1
- ionospheric oblique sounding system 1
- ionospheric propagation 1
- ionospheric structure of type Z 1
- Iorga Nicolae (1871-1940) 2
- Iorga Nicolae(1871-1940) 2