This six-volume encyclopedia is for students in junior high and above. Sensibly, the material is presented in 12 topical sections, rather than as an alphabetical sequence of entries on disparate topics. Coverage includes astronomy and space science, math, earth sciences, energy, environmental sciences, physical sciences, general biology, plant life, animal life, mammals, human sciences, and technology. Each volume has its own bibliography, but only the sixth has the index. Abundantly illustrated. Annotation c. by Book News, Inc., Portland, Or.