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K-Gr 1—Each of these volumes pairs 100 words—split into header phrases, one or two declarative sentences per page, picture labels, and a glossary spread at the end—with brightly colored photos...
Gr 1—2—Anchored by small but legible maps showing each continent's geographical extent, national borders, landforms, and population density, these primer-level surveys systematically deliver broad but simplistic topical overviews...
Gr 8 Up—Each of these attractive, reference-style introductions begins with an overview and then looks more closely at the various facets of the subject, including controversial issues such as stem-cell research...