This is a bibliographic reference for content in the New York Metropolitan Flora Project.
Reference
Stettler, R. F.; Bradshaw, H. D.; Heilman, P. E.; Hinckley, T. M. (eds.) (1996): 1996. Biology of Populus and its implications for management and conservation. NRC Research Press, Ottawa, Ontario, Canada. , 539 pages. (NRC No. 40337; ISBN 0660165066)