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- Floods--California--Orange County--Pictorial works17
- Earthquakes--California--Long Beach--Pictorial works11
- Chaparral1
- Diversion structures (Hydraulic engineering)1
- Gold mines and mining1
- Mines and mineral resources1
- Mining districts1
- Novelists, American--20th Century1
- Placer mining1
- Water-wheels1
- Women authors, American--20th century1