TY - BOOK ED - ebrary, Inc. TI - Protecting visibility in national parks and wilderness areas AV - TD884.5 .P76 1993eb U1 - 363.73/92 20 PY - 1993/// CY - Washington, D.C. PB - National Academy Press KW - Haze KW - Environmental aspects KW - United States KW - Visibility KW - Air quality management KW - National parks and reserves KW - Wilderness areas KW - Electronic books KW - local N1 - Includes bibliographical references (p. 265-313); Electronic reproduction; Palo Alto, Calif.; ebrary; 2013; Available via World Wide Web; Access may be limited to ebrary affiliated libraries UR - http://site.ebrary.com/lib/daystar/Doc?id=10068445 ER -