000			00301nam a2200121Ia 4500
005			20250107154855.0
008			241216s9999||||xx |||||||||||||| ||und||
082			_a690.16 PER.
100			_aPerkins, P. H.
245		0	_aFloors.
260			_aLondon. _bCement and Concrete Association. _c1973
942			_cBK
999			_c7014 _d7014