Search Results for the EPA National Library Catalog

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Select Item	Title	Year Published
1	Altitudinal Variation of Chlorophyll Concentration and Reflectance of the Bark of 'Populus tremuloides.'	1972
2	Genetic variation in response of trembling aspen (Populus tremuloides Michx.) leaves and catkins to sulfur dioxide and ozone /	1975
3	Relationship of Soil Temperature and Cytokinin Production in Aspen Invasion.	1972

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