| 1901 | Bicosoeca spp. |
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| 1902 | Oedogonium, |
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| 1903 | Heptagenia sulphurea |
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| 1904 | Herbarium Image: Oxalis stricta |
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| 1905 | Microcystis, |
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| 1906 | Herbarium Image: Mimulus luteus |
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| 1907 | Ophiocytium, |
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| 1908 | Protective coating of structures against corrosion |
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| 1909 | Herbarium Image: Ruppia maritima |
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| 1910 | Rhizosiphon |
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| 1911 | Phaeodermatium, |
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| 1912 | Anabaena sp., |
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| 1913 | Nostoc, |
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| 1914 | Herbarium Image: Stachys palustris |
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| 1915 | Rhodochorton (Audouinella), |
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| 1916 | Surveillance of Greenhouse Gases |
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| 1917 | Evaluation of historical data on the nutrient status of Esthwaite Water, Cumbria
|
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| 1918 | Investigations into the contribution of Marlborough STW to the non-compliance of Salcombe South Sands with the EC bathing waters directive |
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| 1919 | Oscillatoria, |
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| 1920 | Dinobryon crenulatum and Dinobryon acuminatum |
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| 1921 | Pediastrum, |
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| 1922 | Ceratium, |
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| 1923 | Herbarium Image: Elymus caninus |
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| 1924 | The restoration of the River Pang |
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| 1925 | Hyperparasitism |
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