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The last two decades have been characterized by rapid growth of the tourism industry and increasing awareness of the environmental and social impacts of development. Tourism and travel is the third largest industry in the United States generating approximately seven per cent of the GNP [1]. In 1976, 4.4 million people were employed in travel related jobs [2]. The industry is expected to continue to expand and play an increasingly important role in the economy. By the year 2000, it is estimated that tourism will be the world's largest industry [3]. This research focuses in the state of Pennsylvania, which ranks fifth in travel economic impact in the U.S. [4]. During 1976, travelers in Pennsylvania spent $4.69 billion and the industry employed 181,000 people [5].