Rhodes EL (1986). “An Exploratory Analysis of Variations in Performance among U.S. National Parks.” in Silkman RH (eds.) Measuring Efficiency: An Assessment of Data Envelopment Analysis Jossey-Bass: 47-71.

Rhodes EL (1986). “An Exploratory Analysis of Variations in Performance among U.S. National Parks.” in Silkman RH (eds.) Measuring Efficiency: An Assessment of Data Envelopment Analysis Jossey-Bass: 47-71.

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