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in transit. The UPU provides that stamps from member nations are accepted along the entire international route.

Further developments

The Treaty of Bern had been signed by 21 countries, 19 of which were European. After the General Postal Union was established, its membership grew rapidly as other countries joined. At the second Postal Union Congress in 1878, it was renamed the Universal Postal Union.

French was the sole official language of the UPU until English was added

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