TY - BOOK AU - Hill,Jennifer AU - Gale,Tim TI - Ecotourism and environmental sustainability: principles and practice U1 - 910.684 PY - 2009/// CY - Farnham, England, Burlington, VT PB - Ashgate KW - Ecotourism N1 - Includes bibliographical references and index UR - http://www.columbia.edu/cgi-bin/cul/resolve?clio7884492 ER -