REMOVE

1. machinery
2. sky
3. farms
4. utility poles
5. fences
6. landscapes (representations)

WHAT

1. Visual Works (hierarchy n … (1)
2. barriers (1)
3. black-and-white film (1)
4. concrete block (1)
5. exterior views (1)

More 

WHERE

1. Westminster, Maryland (1)

WHEN

1. 1966 (1)