REMOVE

1. oceans
2. plants
3. seascapes
4. railroads
5. trains (vehicle groupings)
6. cityscapes (representations)

WHAT

1. Visual Works (hierarchy n … (1)
2. automobiles (1)
3. black-and-white film (1)
4. buildings (structures) (1)
5. campuses (1)

More 

WHERE

1. San Francisco, California (1)

WHEN

1. 1970 (1)
2. ca. 1970 (1)