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	1.	No cover image available The choice of journey destination : A theoretical and empirical analysis / Donald Rugg by Rugg, Donald Series: Rand paper series ; p. 4905 Publication details: California : Rand Corporation, 1972 Availability: No items available.
	2.	No cover image available The demand for abstract transport modes : a choice theoretic formulation / Donald D. Rugg by Rugg, Donald D Series: Rand paper series ; p. 4911 Publication details: California : Rand Corporation, 1972 Availability: No items available.

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