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学科
- Golden gate bridge (san francisco, calif.)2
- Hills2
- Mountains2
- San francisco bay (calif.)2
- Bridges1
- Channels1
- Cities & towns1
- Coastlines1
- Dirt roads1
- Doors & doorways1
- Dwellings1
- Electric lines1
- Ford motor company1
- Passengers1
- Rocks1
- Schieffelin house (tombstone, ariz.)1
- Suspension bridges1
- Vessels1
- Whitney, Mount (Calif.)1