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Axial and radial variation in the proportions of sapwood and heartwood in stems of common oak [Quercus robur L.] depending on site type, age class and social class of tree position
Zmiennosc osiowa i promieniowa udzialu bielu i twardzieli w pniach debu szypulkowego [Quercus robur L.] w zaleznosci od siedliska, klasy wieku i pozycji biosocjalnej