Verbatim text: Brittain, W. H. and W. F. Grant. 1967b. Observations on Canadian birch (Betula) collections at the Morgan Arboretum. V. B. papyrifera and B. cordifolia from eastern Canada. Canad. Field-Naturalist 81: 251--262.
Author: Brittain, W.H., Grant, W.F.
Year: 1967b
Title: Observations on Canadian birch (Betula) collections at the Morgan Arboretum. V. B. papyrifera and B. cordifolia from eastern Canada
Journal: Canad. Field-Naturalist
Volume: 81
Pages: 251–262