Media type: E-Article Title: Use of Time for Outdoor Recreation in the United States, 1965–2007 Contributor: Siikamäki, Juha imprint: Elsevier BV, 2009 Published in: SSRN Electronic Journal Language: English DOI: 10.2139/ssrn.1408690 ISSN: 1556-5068 Keywords: Pharmacology (medical) Origination: Footnote: