MLA

Walsh, Natalie, Clinton E Carlson, and United States. Forest Service. Northern Region. State & Private Forestry. The Effect of Low-level Sulfur Dioxide On Sensitive Vegetation : a Background Document for Use In Assessing Air Quality Redesignation for Primitive Areas As Required by the Clean Air Act Amendments of 1977 (p.l. 95-95). : Missoula, MT. : Forest Insect & Disease Management, USDA, Forest Service, Northern Region, State & Private Forestry, 1978.