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	1.	No cover image available No cover image available No cover image available Psychological twin research: a methodological study. Vol.1 by Husen, Torsten ill Material type: Text; Format: print ; Literary form: Not fiction Publication details: Stockholm ; Almqvist and Wiksell ; 1959 Availability: No items available. Add to cart (remove)
	2.	No cover image available No cover image available No cover image available Twins and twin relations by Koch, Helen Lois Material type: Text; Format: print ; Literary form: Not fiction Publication details: Chicago ; University of Chicago Press ; 1966 Availability: No items available. Add to cart (remove)
	3.	No cover image available No cover image available No cover image available Twin births and twins from a hereditary point of view by Dahlberg, Gunnar Material type: Text; Format: print ; Literary form: Not fiction Publication details: Stockholm ; Tidens Tryckeri ; 1926 Availability: No items available. Add to cart (remove)

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