00446nam a2200157Ia 45000010005000000080041000050820014000461000017000602450064000772600054001413000011001956500023002066500021002297000021002507000017002717822190219s1974    ck     gr     000 0 spa d0 a547bR6121 aRoberts John10aQuimica organica de metano a macromoleculas /cRoberts John  aBogotá :bFondo educativo interamericano,c1974  a787 p.14aQUIMICA EN GENERAL24aQUIMICA ORGANICA1 aCaserio Marjorie1 aStewart Ross