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1by Dunning, G. R., Wilton, D. H. C., Herd, R. K.Get access
Published in Transactions of the Royal Society of Edinburgh: Earth Sciences (1989)
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2by Strong, D. F., O'Brien, S. J., Taylor, S. W., Strong, P. G., Wilton, D. H.Get access
Published in Canadian Journal of Earth Sciences (1978)
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