operant_conditioning
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- plot_bwt_hwt.png
- 775×735
- 2016/12/26 15:37
- 6 KB
- plot_bwt_hwt2.png
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- 2016/12/26 15:37
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File
- Date:
- 2012/07/29 22:23
- Filename:
- shorpy_05319.jpg
- Photographer:
- Shorpy.com
- Format:
- JPEG
- Size:
- 614KB
- Width:
- 1700
- Height:
- 1344
- References for:
- child_labor