3 x books of knowledge all A-Z of each category. First contains structure of universe, earth and its resources, matter and energy. Livings things and origin of life, world and plants, world of animals, ecology of living world. Second book - man and society, human body, human mind. The human achievement - history of mankind, philosophy and ideas, politics and government, religions of world, myth, legend and folklore, the arts, language and communications, mathematics, economics and trade, industry and technology, man the inventor. Book 3 - The world today - regions of earth, nations and places. Ready reference, facts and figures. Index. All in good.
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