• Hardy. Yvan
  Faculty of Forestry and Geodesy at Laval University
  
• Mainville, Michel
  Faculty of Forestry and Geodesy at Laval University
  
• Schmitt, Daniel M.
  USDA Forest Service, Northeastern Forest Experiment Station
  

This atlas shows defoliation on annual maps, like its predecessors, but at a much larger scale (approx. 1:11 million vs. approx 1:40 million). It consists of a vegetation map for the budworm region in eastern North America (plate 1), a grid map showing the frequency of outbreaks from 1954 to 1980 by grid square (plate II), and a defoliation map for each year from 1938 to 1980 (plates III-XLV). Each plate also features a corridor running east-west across the budworm region, whose northern and southern boundaries are isotherms. The significance of the corridor can be appreciated by consulting its location on the vegetation (zone B) and grid maps.