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Longitude Leiden-Bonn: description
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AFA FC NGC 11.10
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Longitude Ubagsberg: notes and bills, 1888-1898, TU Delft, NCG 11-21
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AFA FC NGC 11.21
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Longitude Ubagsberg: equipment, 1893, TU Delft, NCG 11-20
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AFA FC NGC 11.20
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Gradmessung reports, 1866-1871, TU Delft, NCG 11-11
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AFA FC NGC 11.11
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Longitude Leiden-Greenwich:report, 1880, TU Delft, NCG 11-15
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AFA FC NGC 11.15
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De Lange observations, TU Delft, NCG 10-3
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AFA FC NGC 10.3
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Notes, TU Delft, NCG 9-15
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AFA FC NGC 9.15
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Bills, TU Delft, NCG 62-4
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AFA FC NGC 62.4
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List of correspondence, 1867, TU Delft, NCG 11-1
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AFA FC NGC 11.1
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Bills, 1845-1855, TU Delft, NCG 9-16
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AFA FC NGC 9.16
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Notes longitude, 1862-1872, TU Delft, NCG 11-8
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AFA FC NGC 11.8
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Notes: geodesy, 1915-1929, TU Delft, NCG 62-3
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AFA FC NGC 62.3
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Longitude Leiden-Greenwich: bills, 1880-1881, TU Delft, NCG 11-16
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AFA FC NGC 11.16
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