Much more of a magazine format than the Whole Earth Catalogs themselves, the Difficult But Possible: Supplement to the Whole Earth Catalog [September 1969] contains corrections to the Spring 69 Catalog (see my other review), and new suggestions. But the real stars here are the articles:

Liferaft Earth: A Hunger Show (held in Berkeley on October 11-18, 1969)
The Unanimous Declaration of *Interdependence (We hold these truths to be self-evident that all species have evolved with equal and unalienable rights...etc.)
Libre (an advanced behavioural research team)
Four changes (Population, Pollution, Consumption, Transformation) - by Gary Snyder; this is only the first draft. The final article can be found in Spring 1971's The Last Whole Earth Catalog: access to tools (see my LT review of that issue for further details)

There is also readers mail and the Farm Bulletin Board.

*The editor can't decide whether to spell interdependence 'interdependance', 'interdepedence' (without an 'n') or the correct spelling 'interdependence'. It's not the only error, but because it's a title heading it is kind'a hard to ignore. ;D ( )