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  1. 1
    Published 1978
    Singapore : Science Council of Singapore : Singapore Manufacturers' Association, 1978.
    64 p. : ill. ; 30 cm.
  2. 2
    by Cleary, Graham J.
    Published 1971
    Singapore, Printed by the Govt. Print. Off.; to be purchased from the Government Publications Bureau, 1971]
    23 p. illus. 25 cm.
  3. 3
    Singapore, Anti Pollution Unit, Prime Minister's Office.
    v. 18 x 25 cm.

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