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- Welch Nurseries.
- Welch Nursery.
- Welch, Bigelow & Co.,
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- Welch, d'Alté A. (d'Alté Aldridge), 1907-1970
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- Welch, Nathan
- Welch, Paul S. (Paul Smith), 1882-1959
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- Weld County Nursery.
- Weld, Clara Jamieson
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- Weld, Frederick Aloysius
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- Weld, Ivan C.,
- Weld, Lewis Hart, 1875-1964
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- Wellappuli-Arachchi, Supun Mindika
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- Wellcome Historical Medical Museum.
- Wellcome Institute for the History of Medicine.
- Wellcome Research Laboratories (Khartoum, Sudan)
- Wellcome Tropical Research Laboratories.
- Wellcome Tropical Research Laboratories. Entomological Section.
- Wellcome Trust (London, England). Centre for the History of Medicine at UCL.
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- Wellcome, Henry S. Sir, (Henry Solomon), 1853-1936
- Wellcome, M. D., Mrs.
- Welle, B. J. H. ter (Ben J. H.)
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- Weller Nurseries Company,
- Weller Nurseries Company.
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- Welles, Samuel P. (Samuel Paul), 1909-1997
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- Wellesley Nurseries.
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- Wellicome, Troy I.
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- Wellings, P. W.
- Wellington Field Naturalists' Club.
- Wellington Nurseries.
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- Wellington, James Lloyd
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- Wellington, W. G.
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- Wells Gardens,
- Wells Nursery And Orchards,
- Wells Nursery,
- Wells Wholesale Nurseries.
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- Wells, Alan W.
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