por Nason, Alvin [autor] | Dehaan, Robert Lawrence, 1930- [autor] | Levesque Dion, Heléne [traductor] | Nason, Alvin. Biological world.
por Boolootian, Richard A [autor] | Sánchez Lozano, Esther [traductor] | Boolootian, Richard A. Zoology.