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Correspondence 'waterpassing', 1917-1918, TU Delft, NCG 8
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Longitude Leiden-Bonn: description
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Correspondence: Quetelet, 1867-1869, TU Delft, NCG 9-11
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Correspondence: Trustees, 1861-1867, TU Delft, NCG 9-2
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Correspondence: Cohen Stuart, 1862-1865, TU Delft, NCG 9-4
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AFA FC NGC 11.22
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AFA FC NGC 10.1
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Correspondence: von Schrack, 1867, TU Delft, NCG 11-7
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Correspondence: Albrecht, 1867-1870, TU Delft, NCG 11-2
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Longitude Ubagsberg: notes and bills, 1888-1898, TU Delft, NCG 11-21
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Various correspondence, 1880-1893, TU Delft, NCG 11-12
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Correspondence: Bassot, 1884-1889, TU Delft, NCG 11-13
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Longitude Ubagsberg: equipment, 1893, TU Delft, NCG 11-20
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Correspondence: Permanent Committee, 1868-1871, TU Delft, NCG 9-12
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Various correspondence, 1850-1857, TU Delft, NCG 9-13
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Gradmessung reports, 1866-1871, TU Delft, NCG 11-11
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AFA FC NGC 10.2
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Longitude Leiden-Greenwich:report, 1880, TU Delft, NCG 11-15
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International Geodetic and Geophysical Union, 1921-1922, TU Delft, NCG 62-2
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De Lange observations, TU Delft, NCG 10-3
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Correspondence: von Littrow, 1867, TU Delft, NCG 11-6A
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Longitude Ubagsberg: correspondence, 1893-1894, TU Delft, NCG 11-18
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Notes, TU Delft, NCG 9-15
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Bills, TU Delft, NCG 62-4
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