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AuthorRuiz Pérez, P. (6)Urbina Merino, A. (5)Arnedo Franco, F. (4)García Gómez, Rosario (3)Aragón Orio, M (2)... moreSubjectenseñanza primaria (30)enseñanza secundaria (23)ciencias de la naturaleza (17)educación preescolar (15)enseñanza obligatoria (15)... moreDate issue1990 - 1998 (62)1983 - 1989 (12)