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Topic
Rivers--Oregon
6
Dams
4
Flood control
2
Water--Pollution
2
Birdhouses
1
California condor
1
Inland water transportation
1
Killdeer
1
Kingfishers
1
Plovers
1
Reclamation of land
1
Salmon
1
Sandpipers
1
Skunks
1
Turkey vulture
1
Water conservation
1