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The following year-end charts were elaborated by Mejía Barquera, based on weekly charts that were published on the magazine Selecciones musicales as compiled on Roberto Ayala's 1962 book "Musicosas: manual del comentarista de radio y televisión"; those charts were, according to Ayala, based on record sales, jukebox plays, radio and television airplay, and sheet music sales [a]. [6]