REMOVE

1. bridges (built works)
2. 1930
3. 1937
4. 1969

WHAT

1. barns (1)
2. barriers (1)
3. black-and-white film (1)
4. buildings (structures) (1)
5. concrete block (1)
6. doors (1)
7. exterior views (1)
8. fields (land) (1)
9. lamps (lighting devices) (1)
10. men (male humans) (1)
11. paths (1)
12. sheds (storage structures … (1)
13. sky (1)
14. snow (precipitation) (1)
15. studios (work spaces) (1)
16. trees (1)
17. utility poles (1)
18. Visual Works (hierarchy n … (1)
19. windows (1)
20. winter (1)
21. woods (plant communities) (1)
22. 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)