License
- Attribution 3.0 United States220
- Attribution 4.0 (CC BY 4.0)114
- CC0 1.0 Universal51
- Public Domain Mark 1.042
- Attribution-NonCommercial-NoDerivs 3.0 United States35
- All rights reserved27
- Attribution-NonCommercial-NoDerivatives 4.0 (CC BY-NC-ND 4.0)13
- Attribution-NonCommercial-ShareAlike 3.0 United States11
- Attribution-NonCommercial 4.0 (CC BY-NC 4.0)6
- Attribution-NonCommercial 3.0 United States5
- Attribution-NoDerivatives 4.0 (CC BY-ND 4.0)2
- Attribution-NoDerivs 3.0 United States2
- Attribution-ShareAlike 3.0 United States1