. . . . "The world of science : teacher's resource pack" . . "The world of science : teacher's guide"@en . "Problems and exercises"@en . . . "The world of science. [Book two]. Teacher's guide" . "The world of science"@en . "The world of science. Teacher's guide" . . "World of science. [Book three.] Teacher's guide" . . . . . "The World of Science teacher's resource pack : supplement" . . . . . . . "Juvenile works"@en . . . "Textbooks"@en . . . . .