This database is a collation and digitization of witness tree attributes at 6,609 PLS corners in 68 scattered townships over nine counties (Ashland County east to Florence County and south to Rush County) in northern Wisconsin. These are the same townships used in Manies, K. L., Mladenoff, D. J., and Nordheim, E. V. 2001. Assessing large-scale surveyor variability in the historic forest data of the original US Public Land Survey. Canadian Journal of Forest Research 31(10): 1719-1730.