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- Deere implement co., San Francisco.
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- Deerfield Nursery Company.
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- Degen, Edward 1852-1922
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- Degenhardt, William G. (William George), 1926-
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- Degland, Jean-Vincent-Yves
- Degli, Ettore Arrigoni
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- Degnan, Patrick H
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- Degner, Mark A.
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- DeGraaf, Richard M.
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- Deichmann, K. Henrik
- Deicke, Edwin Frederick William, 1890-
- Deickert, Adrianne
- Deidier, Antoine, 1746
- Deigaard Nurseries,
- Deighton, Dave
- Deignan, H. G. (Herbert Girton), 1906-1968
- Deiker, C. F. 1836-1892
- Deil, Ulrich
- Deiluiis, Gerardo
- Deimer, Petra
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