As We May Think by Vannevar Bush : http://www.theatlantic.com/unbound/flashbks/computer/bushf.htm

"As We May Think", The Exploratories Project & a Tour of Mindmapping Links at
http://bootstrap.org/dkr/discussion/2801.html
contains a link to one of my old mapping pages. From their group http://groups.yahoo.com/group/unrev-II/

Successful visual explanations often build upon a viewer's experience with such visual tools as maps, graphs, and charts. Reusing a well known visual model can be an efficient way to present data with a similar structure and may reveal unexpected possibilities as the model is tailored to the task at hand. Other data sets demand a completely new approach. When this happens, the challenge is developing a visual system that still triggers a viewer's intuitive understanding. http://www.kaywebs.co.uk/process_maps.htm

"A picture is worth a thousand words. A collage image is worth an encyclopedia." - Oliver!