. . "Aids to navigation." . . "Nautical charts." . . "International Hydrographic Bureau." . . . . . . "Doubtful hydrographic data = Données hydrographiques douteuses"@en . . . "Doubtful hydrographic data = Donées hydrographiques douteuses"@en . . . "Données hydrographiques douteuses"@en . . "Doubtful hydrographic data. Pt. C. Indian Ocean" . "Doubtful hydrographic data. Pt. E. South Pacific Ocean" . "Donées hydrographiques douteuses"@en . "Doubtful hydrographic data. Pt. B. South Atlantic Ocean" . . . "Doubtful hydrographic data Donées hydrographiques douteuses"@en . . . . . "Doubtful hydrographic data. Pt. A. North Atlantic Ocean" . . . . . "Doubtful hydrographic data. Pt. D. North Pacific Ocean" . . . . "Hydrography." . .