"Geography." . . "Oceanography." . . "United Nations. Ocean Economics and Technology Branch," . . "Earth Sciences." . . . . "Manganese mines and mining, Submarine." . . . . . . . "Delineation of Mine-Sites and Potential in Different Sea Areas"@en . "Delineation of Mine-Sites and Potential in Different Sea Areas" . . . . . . . . . . . . . . "Delineation of mine-sites and potential in different sea areas" . "Delineation of mine-sites and potential in different sea areas"@en . . . . . . . . "Electronic books"@en . . . . . . . . . . . . . "United Nations. Ocean Economic and Technology Branch." . . "Manganese nodules." . . "Nodules polymétalliques." . .