"Continental shelf Social aspects." . . . . "Continental shelf Economic aspects." . . "Offshore gas industry Economic aspects." . . . . . . . . "Computer network resources"@en . "Social and economic studies" . . . . . . . . . . "Social and economic studies" . . "Social and economic studies"@en . . . . "Electronic books" . "Electronic books"@en . . . . . . . "Livres électroniques" . . . "Offshore oil industry Economic aspects." . . "Human ecology United States." . . "Oceanography United States." . .