References

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Food and Agriculture Organization of the United Nations. Poplars in forestry and land use. International Poplar Commission. Rome. 1958.
Food and Agriculture Organization of the United States. Poplars and Willows in wood production and land use. International Poplar Commission. Rome. 1979.
Harlow,W., Harrar,E., Hardin,J., White,F. Textbook of Dendrology. McGraw-Hill, Inc. New York. 1991.