000 00374nam a2200133Ia 4500
082 _aIS Code
_bB.I.S
100 _aBureau of Indian Standards[BIS]
245 _aIS:4139-1989. Indian standard calcium silicate bricks - specification
260 _aNew Delhi
_bBureau of Indian Standards
_c1989
300 _a7p.
500 _aENG
890 _aIndia
891 _aGRATIS
999 _c18960
_d18960