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In page Resources for the Future:
"In 2009, an RFF study The State of the Great Outdoors: America's Parks, Public Lands, and Recreation Resources, authored by Margaret Walls, Sarah Darley, and Juha Siikamäki, examined the condition of America's outdoor resources, the demand for recreation, and the financing of conservation, parks, and open space.[citation needed] It was carried out in conjunction with the Outdoor Resources Review Group, a bipartisan assemblage of public officials, conservation specialists, and recreation professionals.
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