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	year = {2011},
	institution = {Defra},
	issn = {AQ08610},
	url = {http://icpvegetation.ceh.ac.uk/ and http://uk-air.defra.gov.uk/library/},
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}
@article {1534,
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	year = {2011},
	institution = {Defra},
	issn = {AQ08610},
	url = {http://uk-air.defra.gov.uk/library/},
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}
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	year = {2011},
	institution = {Defra},
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	url = {http://icpvegetation.ceh.ac.uk/},
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}
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