Distribution of DDT spray for pine butterfly control by Ford Trimotor from Warm Springs airstrip. Boise National Forest, Idaho.
Photo by: Lowell J. Farmer Date: June 24, 1954
Credit: National Archives and Records Administration RG# 95-GP.Records of the Forest Service .General Subject Files. USDA Forest Service Negative Number: 482338 NARA image number: 95-GP-5036-Box0852_039_001_AC