The reading list
Link-out only. Governments, institutions and primary data, not tour operators.
How access actually works
The rules come from Beijing, not from the agency selling you the tour.
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China travel advice
Covers Tibet as part of China, including the permit requirement and the periodic closures. Free and not selling a package.
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Tibet
Volunteer-written and unusually direct about the permit system and what travel there actually involves, because no agency edits it.
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Tibet Autonomous Region
The administrative entity, its boundaries, and how they differ from historic Tibet. Worth understanding before you read anything else.
The part the tour does not cover
A guided tour cannot discuss this, so read it beforehand.
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Central Tibetan Administration
The exile administration in Dharamsala. An explicit political position, openly stated, and the counterpart to the official Chinese account you will hear on the ground.
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Human Rights Watch
Continuous documentation of conditions in Tibet. The reporting that explains why access is controlled.