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2. Lead concentration in Hong Kong roadside dust after reduction of lead level in petrol;Chan;Biomedical and Environmental Science,1989
3. Environmental chemical behaviors of arsenic in soil-plant system and their relations to rice (Oryze sativa L.) growth, development;Chen,1990
4. Utilisation of animal manures and sewage sludges for growing vegetables;Cheung;Agricultural Wastes,1983
5. Background Values of Elements in Soils of China;China Environmental Monitoring General Station,1990