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Pigs
1
Pipelines
1
Plaques, plaquettes
1
Ponds
1
Prothonotary warbler
1
Railroad cars
1
Railroad trains
1
Red-bellied woodpecker
1
Red-shouldered hawk
1
Rivers
1
Rulers (Instruments)
1
Seedlings
1
Sewage disposal plants
1
Stop signs
1
Sun--Rising and setting
1
Tree-rings
1
Trenches
1
Truck-mounted cranes
1
Trucks
1
Viceroy butterfly
1