United States. Forest Service. (1993). Sugar maple crown conditions improve between 1988 and 1992. U.S. Dept. of Agriculture, Forest Service, Northeastern Area, State & Private Forestry ; Forestry Canada.
Chicago Style (17th ed.) CitationUnited States. Forest Service. Sugar Maple Crown Conditions Improve Between 1988 and 1992. [Washington, D.C.?] : [Sainte Foy, Quebec]: U.S. Dept. of Agriculture, Forest Service, Northeastern Area, State & Private Forestry ; Forestry Canada, 1993.
MLA (9th ed.) CitationUnited States. Forest Service. Sugar Maple Crown Conditions Improve Between 1988 and 1992. U.S. Dept. of Agriculture, Forest Service, Northeastern Area, State & Private Forestry ; Forestry Canada, 1993.
Warning: These citations may not always be 100% accurate.