000			00395nam a2200157Ia 4500
020			_a0751400947
082			_a624.16 _bTHO
100			_aThorburn, S. Ed.
245			_aUnderpinning and retention.
250			_aEd.2
260			_aLondon _bBlackie Academic & Professional _c1993
300			_axiv,397p.
700			_aLittlejohn, G. S. Ed.
890			_aUnited Kingdom
999			_c35506 _d35506