| 251 | Ceraclea dissimilis larva, |
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| 252 | Setodes argentipunctellus larva, |
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| 253 | Adult Glossosomatid spurs |
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| 254 | Ceraclea dissimilis case, |
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| 255 | Paraleptophlebia submarginata |
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| 256 | Ecdyonurus insignis |
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| 257 | Heptagenia fuscogrisea |
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| 258 | Ecdyonurus torrentis |
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| 259 | Factors affecting natural smolt production |
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| 260 | The Opening Ceremony of The River Laboratory |
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| 261 | Cover of A Key to the Adults and Nymphs of the British Stoneflies (Plecoptera), with Notes on their Ecology and Distribution |
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| 262 | Front Cover of A Key to the British Fresh- and Brackish-Water Gastropods, with Notes on their Ecology |
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| 263 | Progress Report December 1998 |
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| 264 | Triaenodes bicolor larva, |
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| 265 | Groundwater-surface Water Interactions: A Survey of UK Field Site Infrastructure |
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| 266 | Recorded data from the Swan Hills weather station (weather station 1) in the Wensum Catchment between 2011-2012 |
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| 267 | Fish-eating birds : assessing their impact on freshwater fisheries |
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| 268 | Progress Report December 1993 |
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| 269 | Wensum DTC General information - Supporting Document Monitoring Kiosk A |
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| 270 | Water quality for salmon and trout |
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| 271 | Windermere South Basin Seismic Survey Data 1987 Section 05 |
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| 272 | The use of air cooled blastfurnace slag as an unbound aggregate in the construction industry : BACMI/Environment Agency joint guidelines |
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| 273 | Windermere South Basin Seismic Survey Data 1987 Section 04 |
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| 274 | Windermere South Basin Seismic Survey Data 1987 Section 03 |
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| 275 | Windermere South Basin Seismic Survey Data 1987 Section 02 |
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