TY  - BOOK
AU  - Gagnon, J. D.
TI  - Relationship between site index and foliage nitrogen at two crown levels for mature black spruce
KW  - Nitrógeno en plantas
KW  - Picea mariana
N1  - Sobretiro de : The Forestry Chronicle. 40(2): 169-174, 1964
ER  -