• Allen, S. E., (Ed.) (1974) Chemical Analysis of Ecological Materials. Blackwell Scientific Publications, Oxford .
  • Antonovics, J., Bradshaw, A. D. & Turner, R. G. (1971) Heavy metal tolerance in plants. Advances in Ecological Research, 7, 185.
  • Bradshaw, A. D., Mcneilly, T. S. & Gregory, R. P. G. (1965) Industrialization, evolution and the development of heavy metal tolerance in plants. In: Ecology and the Industrial Society. British Ecological Society Symposium, 5, 327343.
  • Briggs, D. (1976) Genecological studies of lead tolerance in groundsel (Senecio vulgaris L.). New Phytologist, 77, 173186.
  • Clements, H. F. & Munson, J. (1947) Arsenic toxicity studies in soil and in culture solution. Pacific Science, 1, 151161.
  • Craig, G. C. (1977) A method of measuring heavy metal tolerance in grasses. Transactions of the Rhodesia Scientific Association, 58, 916.
  • Dietrich, R. V. (1959) Geology and mineral resources of the Blue Ridge Upland, southwestern Virginia. Virginia Polytechnic Institute Bulletin, 134.
  • Gartside, D. W. & McNeilly, T. (1974) The potential for evolution of heavy metal tolerance in plants. II. Copper tolerance in normal populations of different plant species. Heredity, 32, 335348.
  • Gregory, R. P. G. & Bradshaw, A. D. (1965) Heavy metal tolerance in populations of Agrostis tenuis Sibth. and other grasses. New Phytologist, 64, 131143.
  • Jowett, D. (1958) Populations of Agrostis spp. tolerant of heavy metals. Nature, 182, 816817.
  • Nicholls, M. K. & McNeilly, T. (1979) Sensitivity of rooting and tolerance to copper in Agrostis tenuis Sibth. New Phytologist, 83, 653664.
  • Rocovich, S. E. & West, D. A. (1975) Arsenic tolerance in a population of the grass Andropogon scoparius Michx. Science, 188, 263264.
  • Ross, M. D. (1973) Inheritance of self-incompatibility in Plantago lanceolata. Heredity, 30, 169176.
  • Schwanitz, F. & Hahn, H. (1954) Genetischentwicklungs-physiologische Untersuchen an Galmei- pflanzen. II. Uber galmeibiotypen bei Linum catharticum L., Campanula rotundifolia L., Plantago lanceolata L., und Rumex acetosa L. Zeitschrift fur Botanik, 42, 459471.
  • Wilkins, D. A. (1957) A technique for the measurement of lead tolerance in plants. Nature, 180, 3738.
  • Wilkins, D. A. (1978) The measurement of tolerance to edaphic factors by means of root growth. New Phytologist, 80, 623633.
  • Wu, L. & Antonovics, J. (1975) Experimental ecological genetics in Plantago. I. Induction of roots and shoots on leaves for large scale vegetative propagation and metal tolerance testing in P. lanceolata. New Phytologist, 75, 277282.
  • Wu, L. & Antonovics, J. (1976) Experimental ecological genetics in Plantago. II. Lead tolerance in Plantago lanceolata and Cynodon dactylon from a roadside. Ecology, 57, 205208.