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	1.	No cover image available Analysis of coal and its by products / by Illingworth, S. Roy Griffiths, J [assisted ] Material type: Text; Format: print ; Literary form: Not fiction Publication details: London : Colliery Gaurdian, 1921 Availability: Items available for loan: JRD Tata Memorial Library (1)Call number: 662.62 ILL. Place hold
	2.	No cover image available Researches on the constitution of coal (thesis approved for the degree of doctory of science by the... by S. Roy Illingworth. by Illingworth, S. Roy Material type: Text Publication details: London Colliery Gaurdian 1921 Availability: Items available for reference: JRD Tata Memorial Library: Not for loan (1)Call number: 662.6 N211.

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