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- Anthropological Institute of Great Britain and Ireland
- Anthropological Society of London.
- Anthropological Society of Washington (Washington, D.C.)
- Anthropological Survey of India.
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- Antoine, Franz, 1815-1886
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- Apex Plant Company,
- Apfelbach, Raimund
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- Apostolopoulou, Evangelia
- Apostolov, Apostol
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- App, Frank, 1886-
- Appadoo, Chandani
- Appalachian Evergreen Company,
- Appalachian Forest Experiment Station (Asheville, N.C.)
- Appalachian Fruit Research Station (Kearneysville, W. Va.)
- Appalachian Mountain Club.
- Appalachian Nurseries,
- Appalachian Nursery.
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- Apple Grove Nurseries.
- Apple, Jennifer L
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