. . . . . . . "A study of the removal of sulphur dioxide from library air"@en . "A study of the removal of sulphur dioxide from library air" . . . . . . . . . . . . . . . . . "Air, Conditionnement." . . "Soufre et composés, Dosage." . . "Sulfur dioxide." . . "Library buildings Heating and ventilation." . . "Air Purification." . . "Air, Purification." . . .