| 1801 | Abatement of radioactive releases to water from nuclear facilities |
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| 1802 | Spirogyra, |
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| 1803 | Herbarium Image: Filipendula ulmaria |
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| 1804 | River Wissey hydrometric scheme drilling contract : factual report |
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| 1805 | Nitzschia, |
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| 1806 | Herbarium Image: Molinia caerulea |
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| 1807 | Herbarium Image: Nitella opaca |
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| 1808 | Herbarium Image: Potamogeton pectinatus |
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| 1809 | Herbarium Image: Samolus valerandi |
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| 1810 | Cymbella, |
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| 1811 | Herbarium Image: Senecio aquaticus |
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| 1812 | East Devon public water supply strategy : Exe freshwater model Wimbleball pump storage scheme scenario modelling |
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| 1813 | Herbarium Image: Potamogeton crispus |
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| 1814 | Water quality modelling in the Environment Agency (Report no.28) : present practice and future challenges : Water Quality Modelling Group workshop proceedings |
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| 1815 | Tabellaria |
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| 1816 | Stephanodiscus, |
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| 1817 | River Yealm catchment river water quality classification 1990 |
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| 1818 | Melosira, |
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| 1819 | Herbarium Image: Hypericum tetrapterum |
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| 1820 | River pollution and how to avoid it |
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| 1821 | Herbarium Image: Carex laevigata |
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| 1822 | Cladophora-ball, |
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| 1823 | Pediastrum, |
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| 1824 | Herbarium Image: Nasturtium officinale |
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| 1825 | Herbarium Image: Potamogeton crispus |
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