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Amalia Riza Umami, NIM. 101414253011 and Tri Martiana, NIDN. 0003035607 and Soenarnatalina M., NIDN. 0025126011 (2016) Effect of Smoking Habit, Working Time and Cotton Dust to Pulmonary Function. International Journal of Environment, Agriculture and Biotechnology, 1 (2). pp. 199-195. ISSN 2456-1878