https://ths-uki.org/event/world-hydrography-day/
World Hydrography Day - The Hydrographic Society
Celebrated on 21 June, World Hydrography Day is designed to raise awareness about hydrography and how it plays a role in improved knowledge of the seas and...
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https://geoacoustics.com/insights-celebrating-world-hydrography-day-2026
Insights Celebrating World Hydrography Day 2026
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https://hnhs.gr/poioi-eimaste/fotografiko-arxeio/2026-world-hydrography-day/
2026 WORLD HYDROGRAPHY DAY | ΠΟΛΕΜΙΚΟ ΝΑΥΤΙΚΟ ΥΔΡΟΓΡΑΦΙΚΗ ΥΠΗΡΕΣΙΑ
Jun 24, 2026 - 2026 WORLD HYDROGRAPHY DAY
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https://ahs.asn.au/news/3373192
Australasian Hydrographic Society - EAR World Hydrography Day Event, Sydney
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