Environmental aspects of transportation in cities : basic guidelines for an environmentally sound transportation system in urban areas / United Nations Environment Programme. Industry and Environment Office. —  [Paris] : UNEP, [1986]. —  CIDIMA. —  23 p. : gráf. ; 30 cm. — ( Industry & environment guidelines)
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   1. Transportes urbanos.2. Política de transportes.3. Control ambiental. I. Naciones Unidas. Programa para el Medio Ambiente.