000			00310nam a2200133Ia 4500
008			180613s9999||||xx |||||||||||||| ||und||
041			_aen
082			_a512.4
100			_aCOHN, P.M
245		0	_aFree Rings & their relations
260			_aLondon _bAcademic press _c1971
300			_axvi,346p.
942			_cSR
999			_c76727 _d76727