REMOVE

1. boys
2. trees
3. sky
4. silver gelatin

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. snow (precipitation) (1)
14. studios (work spaces) (1)
15. utility poles (1)
16. Visual Works (hierarchy n … (1)
17. windows (1)
18. winter (1)
19. woods (plant communities) (1)
20. yards (areas) (1)

WHO

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

WHEN

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