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Red-bellied woodpecker
1
Red-shouldered hawk
1
Rhus glabra
1
Rhynchospora
1
Rifles
1
Rivers--Recreational use
1
Roots
1
Roots
1
Rulers (Instruments)
1
Rumex crispus
1
Sabal
1
Sabatia
1
Sand
1
Sassafras
1
Scutellaria
1
Seedlings
1
Senecio
1
Sewage
1
Sewage disposal plants
1
Shagbark hickory
1