@article {4984, title = {Radial trends in cation ratios in tree rings as indicators of the impact of atmospheric deposition on forests}, journal = {Canadian Journal of Forest Research}, volume = {19}, year = {1989}, note = {Tables}, pages = {556-594}, publisher = {NRC Research Press}, address = {Ottawa, Ontario, Canada}, keywords = {Climate, Hemlocks, Red spruce, Soils}, author = {Bondietti, E A and Baes, Charles F and McLaughlin, Samuel B} }