• Shaw, E.E.
  

Every 30 years or more, our forests have been swept by the spruce budworm in epidemic proportions. The insect feeds by preference on the needles of fir and defoliates the trees year after year until death results. The tremendous number of larvae feeding on an affected area may be well over three million per acre, and their feeding on the needles makes a noise which can be actually heard, and sounds like a whispering wind in the forest. [document is incomplete, no map]