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	1.	Occupational Rhinitis Revisited: Emphasis on the Risk Factors in Saudi Industry. [electronic resource] by Ballal, Seifeddin G Publication details: Saudi journal of medicine & medical sciences In: Saudi journal of medicine & medical sciences vol. 4 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	The accuracy of self-reported high noise exposure level and hearing loss in a working population in Eastern Saudi Arabia. [electronic resource] by Ahmed, Hafiz O Dennis, John H Ballal, Seifeddin G Producer: 20041026 In: International journal of hygiene and environmental health vol. 207 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	3.	Occupational health in Saudi Arabia. [electronic resource] by Ballal, Seifeddin G Ahmed, Hafiz O Sebiany, Abdulaziz M Producer: 20071213 In: Occupational medicine (Philadelphia, Pa.) vol. 17 Availability: No items available. Save to lists Add to cart (remove)
	4.	Pulmonary effects of occupational exposure to Portland cement: a study from eastern Saudi Arabia. [electronic resource] by Ballal, Seifeddin G Ahmed, Hafiz O Ali, Basil A Albar, Adnan A Alhasan, Abdullah Y Producer: 20050329 In: International journal of occupational and environmental health vol. 10 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)

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