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The Differences of Respiratory Symptoms and Pulmonary Impairment between Exposure and Unexposured Areas by Dust from Semen Padang Factory. J Respirol Indones [Internet]. 2018 Sep. 17 [cited 2026 May 2];38(3):173-6. Available from: http://www.jurnalrespirologi.org/index.php/jri/article/view/7