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	1.	No cover image available Variety and quality of a nations exports by Hummels, David and Klenow J.Peter Material type: Text; Format: print ; Literary form: Not fiction Publication details: 2005 Other title: Availability: Items available for loan: (1). Place hold Add to cart (remove)
	2.	No cover image available Product differentiation as a sources of comprative advantage by Hummels, David and Levinsohn, James Material type: Text; Format: print ; Literary form: Not fiction Publication details: 1993 Other title: J3729 Availability: Items available for loan: (1). Place hold Add to cart (remove)
	3.	No cover image available Transportation Costs and International Trade in the Second Era of Globalization by Hummels, David Material type: Text; Format: print ; Literary form: Not fiction Publication details: 2007 Other title: J8331 Availability: Items available for loan: (1). Place hold Add to cart (remove)

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