adventurestories(children's anthologies children children'sfiction classics fables fairytales ficciónjuvenil fiction folklore gods godsandgoddesses greek greekgods greekmythology juvenilefiction kids legends materialesenespañol mitologíagriega myths newyorktimesbestseller nyt:childrens-middle-grade=2014-09-07 percyjackson(fictionalcharacter) percyjackson(fictitiouscharacter) roman spanishlanguagematerials teenage) teens traditionalstories(children's youngadultfiction