"Transporturi publice Studii de caz." . . "Sustitución de combustibles Aspectos ambientales." . . "Relatie energie-economie." . . "Gaz naturel." . . "AUTOMOBILES." . . "DIESEL FUELS." . . "Fuel switching Environmental aspects." . . "Aspect environnemental." . . "Spark ignition engines Alternate fuels." . . . . . . . . . . . . . "Livres électroniques" . . . . . "Electronic books"@en . "Electronic books" . "Breathing clean considering the switch to natural gas buses" . "Breathing clean considering the switch to natural gas buses"@en . . . . . . . . . . . . . . . . . . . . . . . . . "Breathing clean : considering the switch to natural gas buses" . . . . . . . . "Breathing Clean Considering the Switch to Natural Gas Buses"@en . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "Autobuses." . . "Gas natural." . . "Omnibus" . . "Poluarea atmosferei Studii de caz." . . "Compressed natural gas." . . "Flüssiggas" . . "Buses." . . "Kraftstoff / Flüssiggas / Dieselkraftstoff / Omnibus / Welt." . . "Autobus." . . "autobus gaz naturel lutte contre la pollution atmosphérique." . . "NATURAL GAS." . . "Hydrocarbures Remplacement." . . "Kraftstoff" . . "Gas Industry." . . "Gas industry." . "Welt" . . "Gaz naturel liquéfié." . . "TRANSPORTATION Automotive Pictorial." . . "Electronic books." . . "Internal combustion engines, Spark ignition Alternate fuels." . . "Internal Combustion Engines." . . "TECHNOLOGY & ENGINEERING Automotive." . . "Véhicule au gaz naturel." . . "GAS FUELS." . . "Moteurs à explosion." . . "Liquefied natural gas." . . . . "Dieselkraftstoff" . .