TY  - BOOK
ED  - Indian standards institution                                                                                                                                                                                                                                   . 
TI  - Method of test for determination of water absorption,apparent specific gravity and porosity of natural building stones / 
U1  - 691.21 
PY  - 1977///
CY  - New Delhi : 
PB  - Indian standards institution , 
ER  -