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	1.	Conservation and the gospel of efficiency : the progressive conservation movement, 1890-1920. / by Samuel P. Hays. by Hays, Samuel P Series: Harvard historical monographs. 40 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Cambridge : Harvard University Press, 1959 Availability: Items available for loan: ATREE Library (1)Call number: 333.720973 HAY .
	2.	No cover image available Nature and man’s fate. / by Garrett Hardin. by Hardin, Garrett James Material type: Text; Format: print ; Literary form: Not fiction Publication details: New York : Rinehart, 1959 Availability: Items available for loan: ATREE Library (1)Call number: 575.09 HAR.
	3.	No cover image available A class-book of botany / by A.C. Dutta. by Dutta, A.C Material type: Text; Format: print ; Literary form: Not fiction Publication details: Calcutta : Oxford University Press, 1959 Availability: Not available: ATREE Library: Withdrawn (1).

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