Gerald W. Williams Collection. Issued also as Senate rept. 928, 51st Cong., 1st sess. [pt.I] Report of committee and Views of the minority. v.1. The Northwest. v.2. The Great Basin region and California. -- [pt.II] v.3. Rocky Mountain region and Great Plains. v.4. Statements by Director Powell and other officers...
Recent years have witnessed extensive destruction of forest growth,
particularly of pine, spruce, and chestnut, in portions of the United
States east of the Rocky Mountains. This injury has been very
generally attributed to insects, and there is evidence that certain
wood and bark-boring species have largely contributed to the...