External Links:

Speleology:

Romanian Federation of Speleology
Romanian Society of Speleology - Carstology
National Speleological Society

Radio ham:

Romanian Federation of amateur radio
Radioamator.ro
CSTA Suceava Radioclub

Sites by same autor:

Incalzire globala - global warning;
Electronica pentru speologie - electronics for speleology;
Expeditii - expeditions
Insule - a romanian ham radio award about islands in rivers