REMOVE

1. wheat
2. machinery
3. farming
4. 1931

WHAT

1. banks (landforms) (1)
2. barns (1)
3. birds (animals) (1)
4. black-and-white film (1)
5. buildings (structures) (1)
6. doors (1)
7. exterior views (1)
8. farmhouses (1)
9. farms (1)
10. farmyards (1)
11. fences (1)
12. fields (land) (1)
13. forests (plant communitie … (1)
14. landscapes (representatio … (1)
15. plants (1)
16. porches (1)
17. roads (1)
18. sidewalks (1)
19. sky (1)
20. soil (1)
21. stairs (1)
22. trees (1)
23. utility poles (1)
24. Visual Works (hierarchy n … (1)
25. windows (1)
26. yards (areas) (1)

Less

WHO

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

WHEN

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