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21

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International encyclopaedia of science and technology / edited by G.D.Raj,Ajay Kumar and Madhu Chhatwal.

Published 1995

22

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International encyclopaedia of science and technology / edited by G.D.Raj,Ajay Kumar and Madhu Chhatwal.

Published 1995

23

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International encyclopaedia of science and technology / edited by G.D.Raj,Ajay Kumar and Madhu Chhatwal.

Published 1995

24

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International encyclopaedia of science and technology / edited by G.D.Raj,Ajay Kumar and Madhu Chhatwal.

Published 1995

25

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The Usborne internet-linked encyclopedia / Kirsteen Rogers...[et al.].

Published 2000

26

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Ensiklopedia sains dan teknologi : Kejuruteraan kimia dan sumber asli .

Published 2000

27

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Ensiklopedia sains dan teknologi : perubatan dan kesihatan.

Published 2000

28

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Ensiklopedia sains dan teknologi : Kejuruteraan mekanikal.

Published 2000

29

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The Blackbirch encyclopedia of science invention / Jenny Tesar and Bryan Bunch.

by Tesar, Jenny
Published 2001

30

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The Blackbirch encyclopedia of science invention / Jenny Tesar and Bryan Bunch.

by Tesar, Jenny
Published 2001

31

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Van Nostrand's concise encyclopedia of science / edited by Christopher G.De Pree, Alan Axelord ; foreword by Glenn D. Considine.

Published 2003

32

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The Gale encyclopedia of science / K.Lee Lerner and Brenda Wilmoth Lerner, editors.

Published 2004