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	1.	The use of disposable hypodermic syringes for collection of mine atmosphere samples. [electronic resource] by Lang, H W Freedman, R W Producer: 19691129 In: American Industrial Hygiene Association journal vol. 30 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	On-filter analysis of quartz in respirable coal dust by infrared absorption and X-ray diffraction. [electronic resource] by Freedman, R W Toma, S Z Lang, H W Producer: 19741007 In: American Industrial Hygiene Association journal vol. 35 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	3.	Kinetic evaluation of the factor used in the Saltzman analysis of oxides of nitrogen. [electronic resource] by Freedman, R W Coulehan, B A Lang, H W Producer: 19700526 In: American Industrial Hygiene Association journal vol. 31 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)

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