Every reference with a DOI in the deposited reference list resolved to a known
work in Crossref or DataCite at the dated check, and none carried a retraction,
withdrawal, or removal notice.
The 18 references without a DOI — listed, not checked
no DOI — not checkedAIC (Agricultural Industries Confederation) Fertiliser Statistics 2006 Report. 2006. Agricultural Industries Confederation Peterborough.
no DOI — not checkedAllen, D.J., Brewerton, L.J., Coleby, L.M., et al. The physical properties of the major aquifers in England and Wales. British Geological Survey Technical Report, WD/97/34 1997. 8.
no DOI — not checkedBarrett M.H. Yang Y. Lerner D.N. French M.J. Tellam J.H. The impact of cities on the quantity and quality of their underlying groundwaters. Environment Agency R&D Technical Report P185 1997.
no DOI — not checkedBingham S. Jackson M. Underground under threat: the state of groundwater in England and Wales. 2006. Environment Agency Bristol.
no DOI — not checkedBristow C.R. Freshney E.C. Penn L.E. Geology of the country around Bournemouth. Memoir for 1:50 000 geological sheet 329 (England and Wales). 1991. HMSO London.
no DOI — not checkedCanter L.W. Nitrates in Groundwater. 1997. CRC Press Boca Raton FL.
no DOI — not checkedCentre for Ecology and Hydrology Hydrometric Register and Statistics 1996–2000. 2000. Centre for Ecology and Hydrology Wallingford.
no DOI — not checkedChilton, P.J., Stuart, M.E., Wagstaff, S.J., Coleby, L.M., Bennett, J., Jones, H.K., Identification and quantification of groundwater nitrate from non-agricultural sources. Environment Agency R&D Technical Report 1996. P32.
no DOI — not checkedEnvironment Agency 2005. South Wessex Recharge and Run-off Model. Phase II Report . Environment Agency South West Region and Wessex Water Ltd Exeter.
no DOI — not checkedGolden Software Inc. Surfer Contouring and 3D Surface Mapping for Scientists and Engineers. Version 7. 1999. Golden Software Inc. Golden CO.
no DOI — not checkedGrath J. Scheidleder A. Uhlig S. Weber K. Kralik M. Keimel T. Gruber D. The EU Water Framework Directive: Statistical aspects of the identification of groundwater pollution trends and aggregation of monitoring results. Final Report. Austrian Federal Ministry of Agriculture and Forestry Environment and Water Management. 2001. European Commission Vienna.
no DOI — not checkedMathias, S.A., Butler, S.P., McIntyre, N., Wheater, H.S., The significance of flow in the matrix of the Chalk unsaturated zone. Journal of Hydrology, 310 2006. 62–77.
no DOI — not checkedMelville R.V. Freshney E.C. British Regional Geology: The Hampshire Basin and Adjoining Areas. 4th edn 1982. HMSO London.
no DOI — not checkedMinitab Inc. Minitab for Windows Release 14.0. 2006. Minitab Inc. Pennsylvania PA.
no DOI — not checkedParker J.M. Chilton P.J. McKittrick R. Nitrate leaching to groundwater from grassland on permeable soils: Summary of BGS investigations 1987–89. British Geological Survey Technical Report WD/89/40c 1989.
no DOI — not checkedParker J.M. Chilton P.J. Bridge L.R. Pore-water nitrate profiles in the Chalk unsaturated zone: Results of the 1990 re-drilling. British Geological Survey Technical Report WD/91/13C 1990.
no DOI — not checkedYoung C.P. Gray E.M. Nitrate in groundwater: The distribution of nitrate in the Chalk and Triassic Sandstone aquifers. Water Research Centre Technical Report TR69 1978.
no DOI — not checkedYoung C.P. Hall E.S. Oakes D.B. Nitrate in groundwater—studies on the Chalk near Winchester Hampshire. Water Research Centre Technical Report TR31 1976.
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