REMOVE

1. trees
2. barns
3. farmhouses
4. farms
5. black-and-white film
6. roads
7. wells (structures)

WHAT

1. Visual Works (hierarchy n … (1)
2. buildings (structures) (1)
3. clouds (1)

More 

WHERE

1. Westminster, Maryland (1)

WHEN

1. 1961 (1)
2. after 1961 (1)