https://catalogue-scientifique.canada.ca/record=3386813~S6*frc
Rechercher Crookston, Nicholas L; Rechercher Colbert, J. J; Rechercher Thomas, Paul W; Rechercher Sheehan, Katherine A; Rechercher Kemp, William P
Intermountain Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, septembre 1990
Publication gouvernementale