REMOVE

1. barriers
2. rivers
3. mountains
4. construction equipment
5. black-and-white film
6. 1936

WHAT

1. Visual Works (hierarchy n … (1)
2. automobiles (1)
3. branches (plant component … (1)
4. bushes (1)

More 

WHERE

1. New Windsor, Maryland (1)

WHEN

1. 1966 (1)
2. after 1966 (1)