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2) Dutch elm disease

Author
Dickens, L. E
Series
Service in action volume no. 2.900
Pub. Date
1978.

3) Elm leaf beetles: characteristics and control

Author
Cranshaw, Whitney
Series
Service in action volume no. 5.521
Pub. Date
1989.

4) Dutch elm disease: occurrence of root grafts

Author
Wischer, Jeffrey G
Series
Service in action volume no. 2.901
Pub. Date
1980.

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