000			00340nam a2200145Ia 4500
005			20240713151911.0
008			240712s9999 xx 000 0 und d
041			_aeng
082			_a531.33 _bCRA
100			_aCrawford, f.s.
245			_aWaves (In si units)
260			_aChennai _b Mcgraw hill _c2018
300			_a626
440			_v lll
999			_c37946 _d37946