"English language Textbooks for foreign speakers." . . "USA." . . "États-Unis" . . "Englischunterricht." . . "Landeskunde." . . . . "United States" . . . "Problems and exercises"@en . . . "Discovering American culture"@en . "Discovering American culture" . . . . . . . . . . "Textbooks"@en . "Discovering American culture. [1]" . . . . "Aufgabensammlung" . "Problems, exercises, etc"@en . . . . . . .