Sites or access points for relevant historical archives
Back issues of the Ecologist from 1970 (vol.1 no.1 July 1970) through to 1999 (vol.29 no.8 Dec 1999) are freely available as PDF files from the Resurgence Trust website.
Entry point to the LSE Green Party archive
The internet archive enables you to find old versions and deleted websites.
Housed at Bristol Uni - in an off-site location so you have to request access a week in advance. There is no online catalogue (yet?).
This is housed at Leeds University Library and the catalogue is available online