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	1.	Case studies of subsistence and transition; example: North Sumatra, Indonesia [by] D. H. Penny. by Penny, David Harry Material type: Text; Format: print ; Literary form: Not fiction Publication details: [Medan? 1964?] Availability: No items available. Add to cart (remove)
	2.	The index of economic-mindedness. by Penny, David Harry Penny, David Harry. Transition from subsistence to commercial family farming in North Sumatra Material type: Text; Format: print ; Literary form: Not fiction Publication details: Bogor, Panitia Seksi Dokumentasi, Survey Agro Ekonomi, 1967 Availability: No items available. Add to cart (remove)
	3.	The role of efficiency research in the improvement of estate management by D.H. Penny and S.B. Simandjuntak. by Penny, David Harry Simandjuntak, S. B [joint author.] Material type: Text; Format: print ; Literary form: Not fiction Publication details: [Medan? 1962?] Availability: No items available. Add to cart (remove)

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