http://nvd3.org/assets/css/nv.d3.css
http://scicurve.com/static/css/nv.d3.css
https://www.omniwallet.org/bower_components/nvd3/nv.d3.css
http://wunderdata.com/wp-content/themes/themetastic/css/nv.d3.css?ver=20120208