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Letcher, John S. (author) conference paper 1993
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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
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Oliver, James C. (author), Letcher, John S. (author), Salvesen, Nils (author) conference paper 1987
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Letcher, John S. (author) conference paper 1981
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Letcher, John S. (author) book 1978
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Letcher, John S. (author) conference paper 1977
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Letcher, John S. (author) conference paper 1974
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Letcher, John S. (author) report