Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Hoekstra, P. E., E. P. Merkel, and H. R. Powers. 1961. Production of seeds of forest trees. Pages 227-232 in Alfred Stefferud (ed.), Seeds. United States Department of Agriculture, Yearbook, Washington, D. C. 591 p.
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