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- Lumbering--California43
- Incinerators--California20
- Sawmills--California13
- Whaling--California13
- Shipbuilding--California7
- Crab fisheries--California6
- Paper mills--California5
- Covered bridges--West (U.S.)4
- Mines and mining--California4
- Dry docks--California1
- Fisheries--California--Pictorial works1
- Indians of North America--California1
- Railroads1
- Railroads--California1
- Reforestation--California1
- Textile mills--California1
- Trestles1
- Turkeys--California1