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Pulleys and gears /
by Glover, David,
Publication:
Crystal Lake, IL : Rigby Interactive Library, 1997
. 24 p. :
27 cm.
Date:1997
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(1),
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Simple machines /
by Isogawa, Yoshihito.
Publication:
San Francisco, CA : No Starch Press, 2011
. viii, 157 p. :
26 cm.
Date:2011
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(1),
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