Verbatim text: Alam, M. T. and W. F. Grant. 1972. Interspecific hybridization in birch (Betula). Naturaliste Canad. 99: 33--40.
Author: Alam, M.T., Grant, W.F.
Year: 1972
Title: Interspecific hybridization in birch (Betula)
Journal: Naturaliste Canad
Volume: 99
Pages: 33–40