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World Hydrography Day Countdown 2024!
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<iframe src="http://calculator.cpu.com.cn/commemorative/world-hydrography-countdown-embedded.php" frameborder="0" scrolling="no" width="400" height="225"></iframe>
World Hydrography Day to publicise the work of hydrographers and the importance of hydrography, particularly in the promotion of safe navigation in international waters and ports, and the protection of marine reserves on June 21.