REMOVE

1. fields (land)
2. trees
3. erosion
4. 1961

WHAT

1. banks (landforms) (1)
2. black-and-white film (1)
3. bushes (1)
4. landscapes (representatio … (1)
5. plants (1)
6. roads (1)
7. rock (1)
8. soil (1)
9. Visual Works (hierarchy n … (1)
10. woods (plant communities) (1)

WHO

1. Campbell, Sandra L. Still (1)
2. Sandra L. Still Campbell; … (1)

WHEN

1. after 1961 (1)