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- Sievers, A. F. (Arthur Frederick), Lowman, M. S. (Morris Samson), and Hurst, W. M. (Wilbur Magruder)
- Circular / United States Department of Agriculture ; no. 581 1941
- Pyrethrum (Plant) -- Harvesting, Pyrethrum (Plant) -- Harvesting -- Machinery, pyrethrins, pyrethroid insecticides, harvesting, mechanical harvesting, plant growth, agricultural machinery and equipment, harvesting equipment, crop quality, Tanacetum coccineum, and Tanacetum cinerariifolium
- 28 p. : ill. ; 23 cm.
- U.S. Dept. of Agriculture
- Organic Roots Collection