http://www.sundance.tv/wp-content/themes/sundance/assets/master/js/picturefill.min.js?ver=1.3
http://homebaseccc.org/hb/updates/concrete5.7.4.2_remote_updater/concrete/js/picturefill.js
https://www.humnutrition.com/updates/concrete5.7.4/concrete/js/picturefill.js
http://goqsystem.com/concrete/js/picturefill.js
http://www.hopwood.ac.uk/concrete/js/picturefill.js
http://ubisense.net/updates/concrete-5.3.2_develop/concrete/js/picturefill.js
http://www.trendone.com/fileadmin/site/js/vendor/picturefill.min.js