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020			_a9788131713297
040			_aMAIN
041			_aEnglish
082			_a624 _bCHO
100			_aChopra, Anil K.
245			_aDynamics of structures
250			_a3rd ed.
260			_aNew Delhi _bPearson _c2007
300			_axxxiv,876p.
650			_aCivil Engineering
942			_cBK
999			_c26689 _d26689