@article {3663, title = {A Comparison of Virgin Spruce-Fir Forest in the Northern and Southern Appalachian System}, journal = {Ecology}, volume = {32}, year = {1951}, month = {January}, pages = {84-103}, keywords = {Ecosystem, Flora -- Classification and description, Trees -- Classification and description, Trees -- Growth}, author = {Oosting, H. J and Billings, W. D} }