Detailed vegetation map in The National Atlas of the United States of America (USGS, 1970, Gerlach).

 This 1:7,500,000-scale map, in the Albers equal-area projection, has 119 vegetation classes for needle leaf, broadleaf, and combined broadleaf/needle leaf forests; shrubs; grasslands; and shrub/grasslands combinations; and grassland/forest combinations. Vegetation areas were symbolized using the colors in this style along with, for some classes, overlaid pattern fills.

U.S. Vegetation Map (1970)

Via loc.gov & esri.com
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Alex E

“Maps are like campfires – everyone gathers around them, because they allow people to understand complex issues at a glance, and find agreement about how to help the land.”