Variation of morphological traits in natural populations of maritime pine (Pinus pinaster Ait.) in Morocco Nadya Wahid, Santiago C. González-Martínez, Ismaïl El Hadrami and Abdelali BoulliAnn. For. Sci., 63 1 (2006) 83-92DOI: https://doi.org/10.1051/forest:20050100