000 00300nam a2200109 i 4500
008 800110s1980 sp g spa
080 1 _a407
100 _aHILL,L.A.
245 0 _aADVANCED STEPS TO UNDERSTANDING
260 _aOXFORD
_b:TAURUS.
_c,1980
997 _dFalta ISBN
_e1