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Our air :
unfit for trees.

APA Citation

United States. Forest Service. (197). Our air: unfit for trees. Rev. [Washington, D.C.?]: U.S. Dept. of Agriculture, Forest Service.

MLA Citation

United States. Forest Service. Our Air: Unfit for Trees. Rev. [Washington, D.C.?]: U.S. Dept. of Agriculture, Forest Service, 197.

Warning: These citations may not always be complete (especially for serials).