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165 Introduction165 ~apunits167 References pertaining to key maP169 Acknowledgments171 Interior spruce and birch forest region171 White spruce 172 White spruce and white birch172 Balsam poplar173 Blackspruce173 Aspen and birch174 Lodgepolepine174 White spruce, alpine fir, lodgepole pine, and black spruce 174 Treeless communities  __ 174 Timberlineforest175 Coastal spruce and hemlock forest region176 Sitka spruce and western hemlock 176 Sitkaspruce177 Westernredcedar177 Alder and black cottonwood ___ 177 Lodgepole and mountain hemlock ____ 178 Coastal timberline forests  -'  ____ ___ 178 Engelmann spruce and lodgepole pine forest region 178 Treeless region 178 Geographic distribution of prominent tree species180 List of species   181 References cited 182 Index185

Vegetation of northwestern North America, as an aid in interpretation of geologic data