Kojima, Masami Breathing clean : considering the switch to natural gas buses / by Masami Kojima. - Washington, D. C. : World Bank, 2001. - ix, 50 p. : ill. ; 30 cm. - World Bank technical paper ; no.516 . Includes bibliographical referencies (p. 49-50). ISBN: 0821350404 Subjects--Topical Terms: Air quality management.Motor fuels.