. . . . . . . . . . "Wikibooks"@mul . . . . . . . . . . "Wikibooks"@en . . . . . "collaborative development of free textbooks"@en . . . "Wikibooks"@en . . . . "Wikibooks"@mul . . . . . . . . . . . . . . . . . . . . . . "library of open-content books written and edited by volunteers"@en . . . . . . . . . . "Wikibooks"@en . . . . . . . . . . . . . . . . . "Wikibooks"@mul . "free multilingual online collection of textbooks"@en . . . . . . . . . . . . .