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	1.	No cover image available No cover image available No cover image available Challenge of conscience : the story of the conscientious objectors of 1939-1949 by Hayes, Denis ill Material type: Text; Format: print ; Literary form: Not fiction Publication details: London ; George Allen and Unwin Ltd ; 1949 Availability: No items available. Add to cart (remove)
	2.	No cover image available No cover image available No cover image available Challenge of conscience : the story of the conscientious objectors of 1939-1949 by Hayes, Denis ill Material type: Text; Format: print ; Literary form: Not fiction Publication details: London ; George Allen and Unwin Ltd ; 1949 Availability: No items available. Add to cart (remove)
	3.	No cover image available No cover image available No cover image available Energy for development: third world options by Hayes, Denis Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington ; World Watch Institute ; 1977 Availability: No items available. Add to cart (remove)
	4.	No cover image available No cover image available No cover image available Nuclear power the fifth horseman Denis Hayes by Hayes, Denis [Author] Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington Worldwatch Institute 1976 Availability: Items available for loan: Directorate of Library Services (UDSM) (1)Collection, call number: IRA-Institute of Resources Assessment IRA HD9698.A2H38. Place hold Add to cart (remove)
	5.	No cover image available No cover image available No cover image available Rays of hope the transition to a Post petroleum World Denis Hayes by Hayes, Denis [Author] Material type: Text; Format: print ; Literary form: Not fiction Publication details: New York W.W. Norton & Company 1977 Availability: Items available for loan: Directorate of Library Services (UDSM) (1)Collection, call number: IRA-Institute of Resources Assessment IRA HD9502.A2H37. Place hold Add to cart (remove)
	6.	Repairs, reuse recycling-first steps toward a sustainable society Denis Hayes by Hayes, Denis [Author] Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington Worldwatch Institute 1978 Availability: Items available for loan: Directorate of Library Services (UDSM) (1)Collection, call number: IRA-Institute of Resources Assessment IRA TD794.4.H39. Place hold Add to cart (remove)
	7.	Energy: the case for conservation by Hayes, Denis [Author] Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington DC: Worldwatch Institute, 1976 Availability: Items available for loan: Directorate of Library Services (UDSM) (1)Collection, call number: IRA-Institute of Resources Assessment IRA TJ63.4.U6 H39. Place hold Add to cart (remove)
	8.	The solar energy timetable by Hayes, Denis [Author] Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington DC: Worldwatch Institute, 1978 Availability: Items available for loan: Directorate of Library Services (UDSM) (1)Collection, call number: IRA-Institute of Resources Assessment IRA TJ810.H38. Place hold Add to cart (remove)
	9.	Pollution: the neglected dimension by Hayes, Denis [Author] Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington DC: Worldwatch Institute, 1979 Availability: Items available for loan: Directorate of Library Services (UDSM) (1)Collection, call number: IRA-Institute of Resources Assessment IRA TD174.H37. Place hold Add to cart (remove)