SeriesWisconsin Conservation Bulletin, 13:5, May 1948, p. 4.
PublisherWisconsin Conservation Commission
Comments"White pine acreage is expected to continue to increase.... Many of the trees are now reaching seed-bearing age. Aspen trees serve as a 'nurse crop' for young white pine, and as the aspens reach maturity, are harvested or are killed by disease, the pines take over."