The treemap visualizes the origin of Open Access items [Fn 01] indexed in the Bielefeld Academic Search Engine (BASE) [Fn 02] on June 27th, 2012. [Fn 03] It shows the continents Europe, Asia, the Americas (North and South America), Oceania, Africa as well as International Organizations highlighting leading countries of each continent. The dominance of the United States of America providing as many Open Access items as Europe and Asia together becomes clear. Pointing out the small amount of Open Access items from Africa the visualization proves that the digital divide is also true for Open Access.
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