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Notes on the Origin of Passport
Wealth, Geopolitics, and the Great Mobility Divide
International Travel Shows Faint Signs of Life
The Ethical Dilemmas Related to Covid-19 Vaccine Passports
Airport Traffic in the US (2019 vs. 2020)
The Impact of Health Security on Travel Freedom
The Relationship Between Political, Economic, and Travel Freedom
Trends in Travel Freedom: The Effect of Travel Freedom on Economic Growth and Democracy
International Travel and the Spread of Covid-19
Border Openness Index 2019 is available