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From investigations on Populus X marilandica, P. X robusta, Fraxinus angustifolia, Quercus robur and Juglans nigra in pure and mixed stands in Czechoslovakia, the author presents data on depth, spread, and relative vertical and horizontal distribution of roots and rootlets of trees and herbs....

Sika, A.; Mraz, K.
Prace Vyzkumneho Ustavu Lesniho CSR, 1964, No. 28, pp 81-137