skos:altLabel | - International Hydrographic Organization#Member countries
- Convention on the International Hydrographic Organization
- Hydrographic Conference in Oslo
- IHO
- International Hydrographic Bureau
- International Hydrographic Conference
- International Hydrographic Organisation
- International Hydrographic Organization (IHO)
- Portuguese Hydrographic Institute
- international chart series
- set by IHO convention
- International Hydrographic Organization’s Council
- International Hydrographic Organization#Publications
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