1.
| Some remarks in May 1968 on secular movements within Denmark
/ Simonsen, O. ; 3. mezinárodní symposium o recentních pohybech zemské kůry, Leningrad, 21. - 30. 5. 1968
Copenhagen: Danish Geo. Inst., 1968
Signatura: K32921
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2.
| Réseau Européen Unifié de Nivellement (R. E. U. N.) Résolutions adoptées á la réunion de Copenhague (Juin 1957)
/ Simonsen, O. ; International Association of Geodesy, General Assembly Toronto, Canada - September 1957
Paris: Association Internationale de Géodésie, 1957
Signatura: K17758
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3.
| Report from the International Commission for European Levelling for the period September 1957 - July 1960
/ Simonsen, O. ; Submitted to the XII General Assembly of the International Union of Geodesy and Geophysic held in Helsinki in 1960
Copenhagen: The Danish Geodetic Institute, 1960
Signatura: K20325
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4.
| Report for the Period Sept. 1963 - July 1967 on R. E. U. N. Réseau Européen Unifié de Nivellement
/ Simonsen, O. ; XIV General Assembly of the International Union of Geodesy and Geophysics held in Switzerland. Sept. - Okt. 1967
Copenhagen: The Dan. Geod. Inst., 1967
Signatura: K37301
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5.
| Report for the Period Sept. 1960 - July 1963 on R. E. U. N. Réseau Européen Unifié de Nivellement
/ Simonsen, O. ; XIII General Assembly of the International Union of Geodesy and Geophysics held in Berkeley, U. S. A., August 1963
Copenhagen: The Danish Geod. Inst., 1963
Signatura: K37615
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6.
| Remarks to calculation of closing errors "sigma" "gama" 0 "delta" h for three netparts of UELN
/ Simonsen, O. ; Intern. Comm. for European Levelling
Copenhagen: Intern. Comm. for European Levelling, 1960
Signatura: 24972
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7.
| Remarks on secular movements within Denmark
/ Simonsen, O. ; Symposium o pohybu zemské kůry, Lipsko 1962
Copenhagen: Danish Geodetic Institute, 1962
Signatura: K23022
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8.
| Rapport suŕ les travaux de ĺ Association Internationale de Géodésie pour la "Compensation du Réseau Européen Unifié de Nivellement". Réunion de Copenhague 25 - 28 Juin 1957 par
/ Simonsen, O. ; Rapport présenté á l´onzieme Assemblée Générale de ĺ Union Géodésique et Géophysique Internationale. Toronto, 3 - 14 Septembre 1957
Copenhague: Institut Géodésique du Denemark, 1957
Signatura: K17757
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9.
| Is the Levelling Datum for a Continental Levelling Network so Stable that it Would Permit the Determination of Secular Movements as Accurate as Modern Precise Levellings May be Observed
/ Simonsen, O. ; Second Symposium for the Commission on Recent Crustal Movements held in Aulanko in Finland in August 1965
b.m.: b.v., 1965
Signatura: 27555
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10.
| Investigations into Seasonal and Diurnal Osciallation of the Differences of Elevation between three Subsoil Bench Marks in Copenhagen by Means of Hydrostatic Levelling
/ Egedal, J. ; Simonsen, O.
Kobenhavn: Geodaetisk Institut, 1954
Signatura: 16038
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