Caption: "mature Ponderosa Pine Tree that has been heavily damaged by porcupines. During the winter months porcupine frequently remain in a single tree for several weeks and remove a large amount of bark as feed."
Caption: "Ponderosa Pine tree that has been damaged by the removal of the bark by a porcupine. The bark and camium layer have been removed to the wood. This damage will cause the tree to die. Boulder Mountian Area."
Caption - "View at Homestake electrically operated sawmill, Spearfish, S. Dakota. Eight foot cut-off saw, for converting whole tree logs into size adaptable for milling, in operation. Supervisor E. A. Snow observing process"