Minnesota's Natural HeritageThe definitive work on Minnesotas natural history and ecologyupdated, expanded, and copiously illustrated to account for profound changes to the states natural landscape over the past twenty five years The story of Minnesotas natural landscape, reaching back to the time of the glaciers, covers at least 12,000 years. Yet even against that vast expanse, recent decades have significantly transformed the natural world that is Minnesotas greatest resource.