Concept
Version 6
Created by Boundless
Static Representations: Images, Drawings, and Graphs
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"All sizes | Prep work for final presentations | Flickr - Photo Sharing!."
http://www.flickr.com/photos/juhansonin/6478093269/sizes/l/
Flickr
CC BY.