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By Nirmal D.   Thijs I.   Bethel J.   Bhal P.   in Journal of Obstetrics & Gynaecology

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Informa Healthcare‎(2006)‎

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By Bethel J. S.   Turnbull K. J.   Briggs D. G.   Flores J. G.   in Journal of Forestry

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Society of American Foresters‎(1975)‎

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