License
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- Attribution 4.0 (CC BY 4.0)756
- Attribution 3.0 United States212
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- Public Domain Mark 1.083
- Attribution-NonCommercial-NoDerivatives 4.0 (CC BY-NC-ND 4.0)75
- Attribution-NonCommercial-NoDerivs 3.0 United States61
- CC0 1.0 Universal56
- Attribution-ShareAlike 4.0 (CC BY-SA 4.0)34
- Attribution-NonCommercial-ShareAlike 4.0 (CC BY-NC-SA 4.0)29
- Attribution-NonCommercial-ShareAlike 3.0 United States14
- Attribution-NonCommercial 3.0 United States7
- Attribution-NoDerivatives 4.0 (CC BY-ND 4.0)6
- Attribution-NoDerivs 3.0 United States6
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- Apache 2.01