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	1.		Image from Google Jackets	Ecology and human need / by Thomas Sieger Derr. by Derr, Thomas Sieger, 1931- Material type: Text; Format: print ; Literary form: Not fiction Publication details: Philadelphia : Westminster Press, [1975] Availability: Items available for loan: MARY IMMACULATE LIBRARY (1)Location, call number: Open Shelf GF 80 .D47 1975. Place hold Save to lists Add to cart (remove)
	2.		Image from Google Jackets	Barriers to ecumenism : the Holy See and the World Council of Churches on social questions / Thomas Sieger Derr. by Derr, Thomas Sieger, 1931- Material type: Text; Format: print ; Literary form: Not fiction Publication details: Maryknoll, N.Y. : Orbis Books, c1983 Availability: Items available for loan: TAMCAS Library (2)Location, call number: TAMCAS General shelves HN37.C3 D446, ... Place hold Save to lists Add to cart (remove)

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