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- catalog contributor b6483644.
- catalog created "1950.".
- catalog date "1950".
- catalog date "1950.".
- catalog dateCopyrighted "1950.".
- catalog description "Academisch proefschrift--Vrije Universiteit, Amsterdam.".
- catalog extent "65 p.".
- catalog issued "1950".
- catalog issued "1950.".
- catalog language "dut eng".
- catalog language "dut".
- catalog publisher "Amsterdam,".
- catalog subject "QA649 .D33".
- catalog subject "Surfaces, Orthogonal.".
- catalog title "Conforme theorie van tripelorthogonale stelsels (with an English summary)".
- catalog type "text".