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- [4] MORPHOLOGICAL VARIATION IN WHITE AND BLACK SPRUCE - INVESTIGATION OF NATURAL HYBRIDIZATION BETWEEN PICEA-GLAUCA AND PICEA-MARIANA CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE, 1978, 56 (20): : 2512 - 2520
- [6] Differences in crown characteristics between black (Picea mariana) and white spruce (Picea glauca) CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE, 2012, 42 (09): : 1733 - 1743
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