REMOVE

1. factories (structures)
2. buildings (structures)
3. Visual Works (hierarchy name …
4. San Francisco, California

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)