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Topic
- Fishways 4
- Rivers 4
- Dams 3
- Fish habitat improvement 2
- Dikes (Engineering) 1
- Fishes 1
- Fishes--Effect of dams on 1
- Hydraulic engineering 1
- Hydraulic structures 1
- Irrigation 1
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Collection
- Angelus Studio photographs, 1880s-1940s 4