TY  - GEN
AU  - Ranawaka, Gaya
AU  - Ratnasiri, Nalini  
TI  - Human biology block VI human against disease
SN  - 9552308593
U1  - 612 
PY  - 1999///
CY  - Nugegoda
PB  - Open University
KW  - HUMAN BIOLOGY
KW  - HUMAN DISEASES
ER  -