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PYATT, F.B., 1973. Plant sulphur content as an indication of air pollution from nineteenth century smelting operations. In: Second International Conference on Bioindicators of Landscape Deterioration, Most, Czechoslovakia [Czech Republic], 1973, Most, Czechoslovakia.
SHACKLEY, M., 1973. Sediment samples from the Alveston Bone Fissure, Gloucestershire. In: Proceedings of the University of Bristol Spelaeological Society.
