50th Anniversary of the International Union of Speleology – UIS
Celebration of the 50th Anniversary was under the honorary patronage of his Excellency Mr. Borut Pahor, The President of the Republic of Slovenia

UIS was established during the 4th International Congress of Speleology, which was held in Ljubljana and Postojna in 1965.
The UIS was officially founded during the Closing Ceremony of the Congress on September 16th in Ljubljana.
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