. . . . . . . . . "Codes for kids" . "Codes for kids"@en . "Explains and illustrates codes which can be used to send secret messages or as brainteasers." . "Juvenile works" . . . . "Juvenile works"@en . "Explains and illustrates twenty-nine codes which can be used to send secret messages or as brainteasers." . "Explains and illustrates twenty-nine codes which can be used to send secret messages or as brainteasers."@en . . . .