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Guijt, W. (author), Mol, M.A.P. (author), Witjens, M.L. (author)A fixed road link between Dover and Calais can be realized by a tunnel, a bridge or The tunnel can be bored which are submerged into a combination of bridge and tunnel or constructed of concrete elements place.master thesis 1987
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- Witjens, M.L. (author) master thesis 1987
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- Guijt, W. (author), Mol, M.A.P. (author), Witjens, M.L. (author) master thesis 1987
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- Guijt, W. (author), Mol, M.A.P. (author), Witjens, M.L. (author) master thesis 1982
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- Witjens, P.H. (author) doctoral thesis 1946
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Witjens, P.H. (author)Document(en) uit de collectie Chemische Procestechnologie.technical drawing 1943