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	1.		The Efficient use of energy / General editor: I.G.C. Dryden by Dryden, I.G.C, 1910- Edition: 2d. ed. Material type: Text; Format: print ; Literary form: Not fiction Publication details: Borough Green : Butterworth Scientific in collaboration with the Institute of Emergy acting on behalf of the U.K. Department of Energy, 1982 Availability: Items available for loan: Main Library - IDA (1)Call number: 621.402 EFF. Place hold Save to lists Add to cart (remove)
	2.		Carbonization and hydrogenation of coal / by I. G. C. Dryden. by Dryden, I. G. C. (Ian Gordon Cumming), 1910- United Nations Industrial Development Organization Material type: Text Publication details: New York : United Nations, 1973 Availability: Items available for loan: Main Library - Africana (1)Call number: UNO/ID/81. Place hold Save to lists Add to cart (remove)
	3.		Carbonization and hydrogenation of coal / by I. G. C. Dryden. by Dryden, I. G. C. (Ian Gordon Cumming), 1910- United Nations Industrial Development Organization Material type: Text Publication details: New York : United Nations, 1973 Availability: No items available. Save to lists Add to cart (remove)
	4.		Carbonization and hydrogenation of coal / by I. G. C. Dryden. by Dryden, I. G. C. (Ian Gordon Cumming), 1910- United Nations Industrial Development Organization Material type: Text Publication details: New York : United Nations, 1973 Availability: No items available. Save to lists Add to cart (remove)
	5.		Carbonization and hydrogenation of coal / by I. G. C. Dryden. by Dryden, I. G. C. (Ian Gordon Cumming), 1910- United Nations Industrial Development Organization Material type: Text Publication details: New York : United Nations, 1973 Availability: No items available. Save to lists Add to cart (remove)