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- Schoyer, H.F.R. (author) report 1980
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- Schoyer, H.F.R. (author) report 1980
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- Schoyer, H.F.R. (author) report 1980
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- Schoyer, H.F.R. (author) report 1979
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- Schoyer, H.F.R. (author) report 1978
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- Schoyer, H.F.R. (author) report 1978
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- Schoyer, H.F.R. (author) report 1978
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- Schoyer, H.F.R. (author) report 1977
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- Korting, P.A.O.G. (author), Schoyer, H.F.R. (author) report 1977
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- Bebelaar, F. (author), Schoyer, H.F.R. (author) report 1977
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- de Boer, R.S. (author), Schoyer, H.F.R. (author), Wolff, H. (author) report 1977
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- Schoyer, H.F.R. (author) report 1977
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- de Boer, R.S. (author), Schoyer, H.F.R. (author) report 1976
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- Schoyer, H.F.R. (author) report 1976
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