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- Latour, Paul B.
- Latourette, Kenneth Scott, 1884-1968
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- Latrobe Valley Field Naturalists Club
- Latrobe, Charles Joseph, 1801-1875
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- Latrubesse, Edgardo Manuel
- Latsague V., Mirtha
- Latsague, Mirtha
- Latsague, Mirtha
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- Lattin, Frank H. (Frank Haak), 1861-1937
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- Laughlin Lily Farm.
- Laughlin Seed Co.
- Laughlin, Harry Hamilton, 1880-1943
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- Laurance, William F.
- Laure, Guido
- Laurec, Alain
- Laurel Dahlia Gardens.
- Laurel Hill Herb Farm (Falls Village, Conn.)
- Laurel Hill Herb Farm (Morristown, N.J.)
- Laurel Hill Nurseries (Stockbridge, Ma)
- Lauremberg, Peter, 1585-1639
- Laurence R. Rupert (Nursery),
- Laurence, Matthew
- Laurence, Matthew H
- Laurendz, Charlotte
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