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1Code of practice for the safe use of soil moisture and density gauges containing radioactive sourcesPublished 1994[Pretoria] : Dept. of National Health and Population Development, 1994.10 p. ; 30 cm.
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2Published 1994[Pretoria] : Dept. of Health, 1994.16 p. : ill. ; 30 cm.
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3Published 1994Pretoria : Dept. of National Health and Population Development, 1994.9 p. ; 30 cm.