Concept
Version 5
Created by Boundless
Onomatopoeia
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"All sizes | SLAM!
| Flickr - Photo Sharing!."
http://www.flickr.com/photos/stevensnodgrass/7170907255/sizes/l/
Flickr
CC BY.