| Subject | |
|  | Plant quarantine--Pacific Islands | 
|  | Plant quarrantine--Pacific Area--International cooperation--Congresses. | 
|  | Plant resources. | 
|  | Plant societies See: Plant communities | 
|  | Plant-soil relationships. | 
|  | Plant-soil relationships See also: Crops and soils | 
|  | Plant systematics. | 
|  | Plant systematics See: Botany--Classification | 
|  | Plant taxonomy See: Botany--Classification | 
| 3 | Plant tissue culture. | 
|  | Plant tissue culture--Dictionaries. | 
| 2 | Plant tissue culture--Oceania--Congresses. | 
|  | Plant, Useful--Northeastern States. | 
|  | Plant varieties --Patents. | 
|  | Plant varieties--Patents--Government policy. | 
|  | Plant varieties--Patents--Law and legislation. | 
|  | Plant virology See: Plant viruses | 
|  | Plant viruses. | 
|  | Plant viruses --Cook Islands. | 
|  | Plant-water relationships. | 
|  | Plantain banana. | 
|  | Plantain banana--Periodicals. | 
|  | Plantain banana--Postharvest physiology. | 
|  | Plantation crops See: Tropical crops | 
|  | Plantation life--Fiction. | 
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