Mailing address:

Bulgaria
Sofia - 1113
National Institute of Geophysics, Geodesy and Geography - BAS	
Acad. G. Bonchev Str., block 3  
Petar Stefanov -  Experimental Laboratory of Karstology	

Tel. +3592 971 30 05; 
     +3592 971 33 75

E-mail: psgeo@abv.bg
        sci-comp@abv.bg
www:
http://prokarstterra.bas.bg
http://prokarstterra.bas.bg/sci-competition