000			00301nam a2200145Ia 4500
082			_a690.12 _bSEH
100			_aSehgal, J. L.
245			_aCavity walls.
260			_c1962
300			_a18p.
500			_aENG
890			_aIndia
891			_aGratis from B. N. Vishwanathan
999			_c4110 _d4110