A survey of pond loss in Essex, South-ea
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D. J. Heath; A. Whitehead
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Article
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1992
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John Wiley and Sons
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English
β 481 KB
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1. Sample areas of the county were used to estimate pond loss. An extensive survey used only maps while a smaller, intensive survey combined maps with a field study. In total, 283.43 km2 were surveyed, approximately 7% of the total area. 2. Fifty-five per cent of the ponds present in 1870 had disap