TY  - GEN
AU  - Subasinghe , N. D.
AU  - Samarakoon , A.S.M.N.B.
TI  - Essentials of geology: practical work book
U1  - 551 
PY  - 2001///
CY  - Nugegoda
PB  - Open university of Sri Lanka
KW  - ESSENTIALS GEOLOGY
KW  - MINERAL INDUSTRIES
KW  - CONSTRUCTION SITES
KW  - CONSTRUCTION MATERIALS
KW  - ENVIRONMENT
ER  -