This was long before Correspondence analysis was first used (1952), the now classic applications of ordination to plant communities by J. Roger Bray and John T. Curtis and David W. Goodall and the theoretical foundations of gradient analysis was developed by Whittaker and others (1970s onwards).
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Grime, J.P., Hodgson, J.G. and Hunt, R. (2007) Comparative Plant Ecology: A Functional Approach to common British Species, 2nd edn.