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Pitamber Singh Negi and Sandeep Sharma 2025. Effect of Different Concentrations of Gibberellic Acid on Seed Germination Behaviour and Seedling Vigour Index of Betula Utilis D. Don. Annals of Arid Zone. 64, 2 (Jun. 2025), 199–204. DOI:https://doi.org/10.56093/aaz.v64i2.161434.