The entire 35-year archive of Whole Earth Catalogs, along with its Supplements, and descendant magazines – CoEvolution Quarterly, and Whole Earth are now available on the web. The Whole Earth Catalog,was published in 1968 by Stewart Brand, it and its related magazines embodied a certain type of Californian environmental thinking. A key concept was systems – which included thinking about people, and computers, as well as ecosystems, and when I read first read issues of the magazine as a teenager in the 1980s it was my first exposure to systems theory.
The full archive is in a difficult to navigate scanned form, which is difficult to link to or search, however some of the later articles are available as text. However the archive includes lots of interesting stuff. For example, Dana Meadows famous article on where to intervene in a system there. Other interesting bits include articles by ecologists such as HT Odum, Paul Ehrlich, and Buzz Holling as well as an issue focused on scenario planning.