Lake States Aspen Report No. 6
Aspen Report 1
U.S. Dept. of Agriculture, Forest Service, Lake States Forest Experiment Station
While most hardwood and softwood lumber usually is graded, aspen lumber is not. On the contrary, it is usually sold by the sawmill to the wood manufacturing plant on a mill-run basis. Plants which saw aspen lumber for their own use rarely apply standard grades in sorting the lumber. They usually separate the "usable" from the "cull" lumber, basing their grade breakdown upon the minimum quality acceptable in their manufacturing process. Manufacturers who use only certain grades of aspen lumber, and who buy it on the open market, have been unable to locate sources from which graded aspen lumber is available.
Zasada, ZA. 1948. Aspen lumber grades and characteristics. Lake States Aspen Report No.6. USDA Forest Service Lake States Forest Experiment Station