One of the most amazing opportunities, and a highlight of my scientific career, was to be selected to author a chapter in this landmark book on rivers and stream ecosystems, edited by three of the top aquatic ecologists in the world.  The original edition by Elsevier is out of print and it sold for about $200 I wrote the chapter on Middle America Rovers and Streams, encompasing Mexico, Central America and Panama and the Caribbean.  It was an extraordinary effort for a young biologist working in a remote area of Central America with no electricity, running a little Mac computer off car batteries. This edition by the University of California Press, released in 2006, has a new introduction and it is definitely more affordable than the original.  It can be purchased at Amazon or ordered directly from the Press.