Pesados y ligeros : un libro de animales opuestos= Heavy and Light --an animal opposites book / por Nathan Olson ; traducción Martin Luis Guzman Ferrer = Heavy and light : an animal opposites book / by Nathan Olson ; translation, Martín Luis Guzmán Ferrer.
"Brief text introduces the concepts of heavy and light, comparing some of the world's heaviest and lightest animals -- in both English and Spanish"--Provided by publisher.
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