You're looking for a PDF version of the Natural Science textbook for 4th grade primary school, specifically the Santillana edition. I can try to help you with that!
Santillana is one of Spain’s leading educational publishers, widely used in both public (colegios públicos) and private schools. The textbook is part of the "Saber Hacer" or "Construyendo Mundos" series, aligned with the LOMLOE (Celaá Law) educational framework.
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