• Lutz, John
  U.S. Forest Products Laboratory, Madison, Wis
  

A study was initiated in 1961 to obtain a better understanding of how wood quality affects veneer and plywood made from softwoods. It was evident early in the study that growth rate has a major effect on the principal softwood veneer species, Douglas-fir, which has a marked contrast in density between the springwood and summerwood. The study was then broadened to determine if the same obsevation was true for other softwoods, such as southern pine, that also have a definite contrast in density between springwood and summerwood.