(The International Hydrographic Organization), wpe (July 26, 2018). "International Hydrographic Organization Brochure"(PDF). International Hydrographic Organization. Archived(PDF) from the original on 30 November 2018. Retrieved May 14, 2022.
(The International Hydrographic Organization), wpe (July 26, 2018). "International Hydrographic Organization Brochure"(PDF). International Hydrographic Organization. Archived(PDF) from the original on 30 November 2018. Retrieved May 14, 2022.