Message from the UNESCO Director-General on the Occasion of the International Day of Caves and Karst
On the occasion of the International Caves and Karst Day, observed on ۱۳ September, Dr. Khaled El-Enany, UNESCO Director-General, issued…
On the occasion of the International Caves and Karst Day, observed on ۱۳ September, Dr. Khaled El-Enany, UNESCO Director-General, issued…