W. L. AckermanU.S. National Arboretum, Science and Education Administration, Agricultural Research, U.S. Department of Agriculture, Washington, D.C. 20002
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H. T. Jayne
H. T. JayneU.S. Plant Introduction Station, Science and Education Administration, Agricultural Research, U.S. Department of Agriculture, Glenn Dale, MD 20769
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W. L. AckermanU.S. National Arboretum, Science and Education Administration, Agricultural Research, U.S. Department of Agriculture, Washington, D.C. 20002
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H. T. Jayne
H. T. JayneU.S. Plant Introduction Station, Science and Education Administration, Agricultural Research, U.S. Department of Agriculture, Glenn Dale, MD 20769
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Contributor Notes
Received for publication September 15, 1979.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.