000			00293nam a2200121Ia 4500
008			160710s1954 xx 000 0 und d
082			_a530.1 BAL
100			_aBALLARD,S.S.
245			_aPHYSICS PRINCIPLES
260			_bVAN NOSTRAND REINHOLD COMPANY _c1954
300			_a757
942			_2ddc _cB
999			_c35210 _d35210