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Science and technology in the Middle Ages /
by Findon, Joanne,
Publication:
St. Catharines, Ont. : Crabtree Pub, 2005
. 32 p. :
, Includes index.
29 cm.
Date:2005
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(1),
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The Chinese thought of it : amazing inventions and innovations /
by Ye, Ting-xing,
Publication:
Toronto : Annick Press, 2009
. 47 p. :
28 cm.
Date:2009
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Copies available:
(1),
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