Singh, B. and Tripathi, K.P. 2007. Temporal Variations of Nutrient Concentration in Leaf and Twigs of <I>Populus deltoides</I> Trees. Indian Forester. 133, 9 (Sep. 2007), 1207–1215. DOI:https://doi.org/10.36808/if/2007/v133i9/1197.