000			00262 a2200121 4500
080			_a541.5 _bF 977 T
245	1		_aTheory of valency _cby J.J. Friend
250			_a2nd rev. edn.
260			_c1915
650			_aValency
100	1		_aFriend, J.N. _d
901			_a528
999			_c26379 _d26379