From: Rick Prelinger (email suppressed)
Date: Thu Feb 14 2008 - 18:43:31 PST
Issues of the paper would be in public domain in the US if published without proper copyright notice. (This condition is invalid for works published post-1989.)
Peter Hirtle at Cornell has posted an excellent chart of copyright duration and expiration, which can easily be found with an online search.
Prelinger Library & Archives, San Francisco
Board President, Internet Archive
For info on FrameWorks, contact Pip Chodorov at <email suppressed>.