Though old-growth forests were long gone, Minnesota's timber industry revived in the 1980s when new technology made the ubiquitous aspen tree a desired commodity. For a decade Minnesota had the fastest-growing timber trade in the country. But even as pulp, paper, and chipboard mills continue to expand, questions have arisen about whether the forest is growing as fast the businesses it supports. Mainstreet Radio's Leif Enger has part two of our series, "OUR STATE, OUR FORESTS". When George Boorman was a young lumberjack in the 1920s and 1930s, the men used axes and crosscut saws and horses. And they cut big