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