Networks issues 1 - 12 (from Summer 2007 up to Spring 2011) are available as pdfs here. We also have hard copies of these 12 issues so, if you are based in the UK and would like us to send you any of the magazines, please contact us at firstname.lastname@example.org (Please note that some earlier issues are in short supply).
The following link to the online issues:
Networks issues 13 to 15
Networks issue 16