1.
Modern Science Problems; a Textbook in General Science
by Obourn, Ellsworth Scott, He...
ISBN: 9781171862178
List Price: $31.75
2.
Modern Science Problems; A Textbook in General Science
by Obourn, Ellsworth Scott
ISBN: 9781152672550
List Price: $47.89
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Discovering World of Science (Science Programme for Schools)
by Ellsworth Scott Obourn, etc.
ISBN: 9780442062569
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Exploring World of Science (Science Programme for Schools)
by Ellsworth Scott Obourn, etc.
ISBN: 9780442062576
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Modern Science Problems; a Textbook in General Science
by Obourn, Ellsworth Scott
ISBN: 9781290959735
List Price: $28.95