TY  - BOOK
AU  - Herak M Ed.
AU  -  Stringfield V T Ed.
TI  - Karst :  Important Karst regions of the Northern He   
SN  - 0444408495
U1  - U21.1-1.N7, L2 
PY  - 1972///
CY  - Amsterdam
PB  - Elsevier          
KW  - Geomorphology
ER  -