References
- Billett, M. F. & Cresser, M. S., 1992. Predicting stream-water quality using catchment characteristics and soil chemical characteristics. — Environ. Pollut. 77: 263–268.
- Duarte, C. M. & Kalff, J., 1989: The influence of catchment geology and lake depth on phytoplankton biomass. — Arch. Hydrobiol. 115: 27–40.
- Edwards, R. W., Gee, A. S. & Stoner, R. W., 1990: Acid Waters in Wales. — Klewer Academic Publishers, London.
- Fuller, R. M., Groom, G. B. & Jones, A. R., 1994: The Land Cover Map of Great Britain: An Automated Classification of LANDSAT Thematic Mapper Data. — Photogramm. Eng. Remote Sensing 60: 553–562.
- Hall, J., Hornung, M., Freer-Smith, P., Loveland, P., Bradley, I., Langan, S., Dyke, H., Gascoigne, J. & Bull, K., 1997: Current status of UK critical loads data — December, 1996. — Report to the Department of Environment, ITE Monks Wood, UK.
- Hornung, M., Le-Grice, S., Brown, N. & Norris, D., 1990: The role of geology and soils in controlling surface water acidity in Wales. In: Edwards R. W., Gee A.S. and Stoner J.H. (eds): Acid Waters in Wales. 55–66. Klewer Academic Publishers, The Netherlands.
- Hunsaker, C. T., Levine, D. A., Timmins, S. P., Jackson, B. L. & O'neill, R. V., 1991: Landscape characterisation for assessing regional water quality. — Report to the U. S. Government Contract No. DE-ACOS-840R21400 997–1006.
- Jenkins, A., Harriman, R. & Tuck, S. J., 1990: Integrated hydrochemical responses on the catchment scale. — In: Mason B. J. (ed.): The Surface Water Acidification Programme: 47–54. — Cambridge University Press, Cambridge, UK.
- Juggins, S. J. & Ter Braak, C. J. F., 1993: CALIBRATE v o. 52 (Beta Test) — a computer program for species — environment calibration by [weighted averaging] partial least squares regression. — ECRC, University College London.
- Manly, B. J. F., 1992: The Design and Analysis of Research Studies. — Cambridge University Press, Cambridge.
- Patrick, S., Juggins, S., Waters, D. & Jenkins, A., 1991: The United Kingdom Acid Waters Monitoring Network: Site description and Methodology Report. — ENSIS, London.
- Reuss, J. O. & Johnson, D. W., 1986: Acid Deposition and the Acidification of Soils and Waters. — Springer-Verlag Inc., New York 119 pp.
- Reynolds, B., Neal, C., Hornung, M., Hughes, S. & Stevens, P. A., 1988: Impact of afforestation on the soil solution chemistry of stagnopodzols in mid Wales. — Water Air Soil Pollut. 38: 55–70.
- Ter Braak, C. J. F., 1990a: — CANOCO — a FORTRAN Program for CANOnical Community Ordination by [Partial] [Detrended] [Canonical] Correspondence Analysis, Principle Components Analysis and Redundancy Analysis (Version 3. 1). — Agricultural Mathematics Group, Wageningen.
- Ter Braak, C. J. F., 1990b: Update notes: CANOCO ver 3. 10. — Agricultural Mathematics Group, Wageningen.
- Thompson, T. R. E. & Loveland, P. J., 1985: The acidity of Welsh soils. — Soil Use Manage. 1: 21–24.
- Van Den Wollenburg, A. L. 1977: Redundancy Analysis. An alternative for canonical correlation analysis. — Psychometrika 42: 207–219.
- Williams, D., & Ramsay, J. G., 1959: Geology of some Classic British Areas: Snowdonia. — Geologists' Association Guides No. 28, Benham & Co. Ltd., Colchester.