REMOVE

1. forests (plant communities)
2. barns
3. roads
4. clouds
5. buildings (structures)

WHAT

1. Visual Works (hierarchy n … (1)
2. banks (landforms) (1)
3. black-and-white film (1)

More 

WHERE

1. Maryland (1)

WHEN

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