Concept
Version 8
Created by Boundless
Distribution Centers vs. Direct Store Delivery
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Optimum Sleep (C) Optimum Sleep :: Geograph Britain and Ireland."
http://www.geograph.org.uk/photo/2870773
Geograph
CC BY-SA.