6 copies of 4 on-level titles, 24 books total.
Single copy of Montañas rusas (On-Level). A collection of articles linked together by the topic of roller coasters.
Single copy of Descubrimientos ocultos(On-Level). A collection of articles linked together by the topic of hidden discoveries.
Single copy of Explorador T.H. Culhane: Soluciones energéticas, On-Level. A collection of articles linked together by the topic of energy needs and solutions.
Single copy of Cuevas increíbles, On-Level. A collection of articles linked together by the topic of caves and how they form.