License
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- Attribution 4.0 (CC BY 4.0)743
- Attribution 3.0 United States213
- Attribution-NonCommercial 4.0 (CC BY-NC 4.0)91
- Public Domain Mark 1.075
- Attribution-NonCommercial-NoDerivatives 4.0 (CC BY-NC-ND 4.0)69
- Attribution-NonCommercial-NoDerivs 3.0 United States59
- CC0 1.0 Universal51
- Attribution-ShareAlike 4.0 (CC BY-SA 4.0)35
- Attribution-NonCommercial-ShareAlike 4.0 (CC BY-NC-SA 4.0)29
- Attribution-NonCommercial-ShareAlike 3.0 United States17
- Attribution-NoDerivs 3.0 United States6
- Attribution-NonCommercial 3.0 United States6
- Attribution-NoDerivatives 4.0 (CC BY-ND 4.0)5
- Attribution-ShareAlike 3.0 United States2
- Apache 2.01