| 526 | Time of travel on the [River] Chertsey Bourne under low flow conditions |
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| 527 | Regional fishing guide : a guide to day ticket waters in the Midlands |
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| 528 | Non-compliance of the Bidwell Brook with river quality objectives |
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| 529 | Flood warning information for the Hertfordshire/Essex border : River Stort catchment |
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| 530 | River Axe Fish Study - Evaluation of Fish Movements in the Estuary |
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| 531 | Waste : strategic waste management survey : landfill within the East Midlands planning region |
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| 532 | Identification of water quality problems in the Strat and Neet catchments |
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| 533 | Snapshots of the environment : managing our freshwater fisheries |
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| 534 | The effects of fishing at low water levels |
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| 535 | 1967 - George and Gideon cutting mbati for the bedroom block. |
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| 536 | 1967 - Quakers arriving on the shore of L.George. |
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| 537 | First annual review of the Taw/Torridge estuary catchment management plan (1996)
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| 538 | Suffolk estuarine strategies : Blyth estuary strategy : introduction to the strategy |
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| 539 | Method for the assessment of river water quality using benthic macroinvertebrates |
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| 540 | The evaluation of a Philips ammonium ion selective electrode (220/14/T) |
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| 541 | The greening of Grasmere: its plankton periodicity in 1988 |
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| 542 | A strategic review of the petroleum refinery Industry Sector |
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| 543 | Guidelines for river corridor surveys in the NRA : February 1992. draft 3 |
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| 544 | Contribution of small streams to potential fish production in the Conwy catchment |
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| 545 | The ecology and management of riverine trees : interim report |
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| 546 | Low-cost modifications of the Crump weir to improve fish passage |
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| 547 | Policy and practice for the protection of groundwater - Thames region appendix |
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| 548 | Policy and practice for the protection of floodplains |
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| 549 | 'Sea Vigil' water quality monitoring : the Wash 1992-1993 |
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| 550 | Second annual review of the Seaton, Looe and Fowey catchment management plan |
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