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• Auswärtiges Amt · Open Data
• FCDO travel advice · Open Government Licence v3.0
• U.S. Department of State travel advisories (public domain)
• Wikipedia: visa requirements by nationality · CC BY-SA 4.0
• Passport Index dataset (MIT)
• Wikidata (CC0) · IANA time zones
• ECB reference rates via Frankfurter · Rates By Exchange Rate API
• Natural Earth (public domain) · flag-icons (MIT) · globe.gl (MIT)

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