Inventors and discoverers : changing our world
National Geographic Book Service
National Geographic Society, 1988
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Untermeyer, Louis
Makers of the modern world : the lives of ninety-two writers, artists, scientists, statesmen, inventors, philosophers, composers, and other creators who formed the pattern of our century / by Louis Untermeyer
Simon and Schuster, 1955
 Buku Teks
Garland, John K., author
Chemistry of our world
Macmillan, 1975
 Buku Teks
Gaunt, Jeremy, author
Our world now : Reuters
Thames & Hudson, 2010
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Our world's heritage
National Geographic Book Service.
National Geographic Society, 1987
 Buku Referensi
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