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| Virginia Cooperative Extension. | Using pitfall traps to monitor insect activity. | http:/ / pubs.ext.vt.edu/ 444/ 444-416/ 444-416.html |
| Virginia State University. | A guide to successful pruning: Pruning basics and tools. | http:/ / www.ext.vt.edu/ pubs/ nursery/ 430-455/ 430-455.html |
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