High Quality Content by WIKIPEDIA articles! The National Park Service underwent an intensive review of its responsibilities and prospects for the future during its 75th anniversary celebration in 1991. It culminated its efforts in October 1991 with a symposium in Vail, Colo. that including several hundred participants from both within and outside the NPS. The gathering, the Oct. 10, 1991 session of which was officially a public meeting advertised in the Federal Register of Sept. 19, 1991, resulted in six strategic objectives and the identification of a variety of issues and recommendations, which were published in a book titled National Parks for the 21st Century: The Vail Agenda (Library of Congress Card Number: 92-60741). Although the meeting took place during the administration of Secretary of the Interior Manuel Lujan and NPS Director James Ridenour, with the book itself published under the leadership of Secretary Bruce Babbitt and Director Roger Kennedy, who wrote the foreword...