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Letcher, John S. (author), Cressy, C.P. (author), Oliver, J.C. (author), Fritts, M.J. (author)
journal article 1987
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Letcher, John S. (author), Cressy, C.P. (author), Oliver, J.C. (author), Fritts, M.J. (author)
conference paper 1987