Gjennomsnittlig GPS-koordinater for postnummer 289-23: 50.233, 14.9
Notering byer:
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Boží Dar 289-23,
Nymburk, GPS-koordinater: 50.2333,14.9
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Milovice 289-23,
Nymburk, GPS-koordinater: 50.2333,14.9
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Mladá 289-23,
Nymburk, GPS-koordinater: 50.2333,14.9