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- one exception. Hybrids between species in different sections are nearly unknown today in North America, except for hybrid swarms between the introduced21 KB (2,479 words) - 16:24, 9 December 2021
- extension services or their regional equivalents. In addition, many regions have "user-friendly" weed manuals that are tailored to the needs of agriculturalists18 KB (2,716 words) - 22:53, 13 February 2019