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	1.	Is there an optinum level of population? Singer, S. Fred by Singer, S. Fred [Author] Material type: Text; Format: print ; Literary form: Not fiction Publication details: New York McGraw Hill 1971 Availability: Items available for loan: Directorate of Library Services (UDSM) (1)Collection, call number: IRA-Institute of Resources Assessment IRA HB881.18. Place hold Add to cart (remove)
	2.	No cover image available No cover image available No cover image available Energy from scientific Amarican S. Fred Singer by Singer, S. Fred [Author ] Material type: Text; Format: print ; Literary form: Not fiction Publication details: San Fransisco W. H. Freeman and Company 1970 Availability: Items available for loan: Directorate of Library Services (UDSM) (1)Collection, call number: Science and Engineering Collection QTO TJ163.2.E4842. Place hold Add to cart (remove)

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