Similar to 万国郵便連合憲章

Surface Air Lifted

European Conference of Postal and Telecommunications Administrations

Aerogram

Wrapper (philately)

International reply coupon

World Post Day

Universal Postal Union

Charter of the United Nations

Chapter VII of the United Nations Charter

UN Enemy State Clause

International Convention on the Elimination of All Forms of Racial Discrimination

Vienna Declaration and Programme of Action

Outer Space Treaty

Escazú Agreement

Aarhus Convention

Vienna Convention for the Protection of the Ozone Layer

Montreal Protocol

Vienna Convention on Diplomatic Relations

Treaty on the Non-Proliferation of Nuclear Weapons

Nuclear Terrorism Convention

Treaty on the Prohibition of Nuclear Weapons

Environmental Modification Convention

Earth Summit

Rio Declaration on Environment and Development

United Nations Framework Convention on Climate Change