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	1.	Our national parks : America's spectacular wilderness heritage. by Reader's Digest Material type: Text; Format: print Publication details: New York : The Reader's Digest Association, c1989 Availability: Items available for loan: Ladislao N. Diwa Memorial Library (1)Call number: E160.093 Ou7 1989. Add to cart (remove)
	2.	Environmental interpretation : a practical guide for people with big ideas and small budgets / Sam H. Ham. by Ham, Sam H Material type: Text; Format: print Publication details: Golden, Colo. : North American Press, c1992 Availability: Items available for loan: (1). Add to cart (remove)

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