Phloem necrosis : a virus disease of the American elm / by Roger U. Swingle.
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| Main Author: | |
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| Corporate Author: | |
| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington, D.C. :
U.S. Dept. of Agriculture,
1942.
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| Series: | Circular (United States. Department of Agriculture) ;
no. 640. |
| Subjects: |
| Item Description: | Caption title. |
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| Physical Description: | 8 pages : illustrations ; 24 cm. |