. . "Refrigeration and refrigerating machinery." . . "Air conditioning." . . . . "A textbook of refrigeration and air conditioning"@en . . . . . . "A text book of refrigeration and air-conditioning"@en . . . "A Textbook of refrigeration and air conditioning" . "Textbook of refrigeration and air conditioning" . "A Textbook of refrigeration and air conditioning"@en . "Textbook of refrigeration and air conditioning"@en . . . . . . . .