REMOVE

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

WHAT

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

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WHERE

1. Maryland (1)

WHEN

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