|Publisher:||Avon, Vila, Zen and Orac Appreciation Society, president may have been Chris Clark|
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Regarding the title: "IMIPAK (occasionally referred to in apocrypha as IMIPAC) was a weapon developed by Coser. Its name stood for Induced Molecular Instability Projector And Key." 
IMIPAC 4 was published in June 1982.
IMIPAC 5 was published in February 1983 and contains 30 pages.
IMIPAC 6 was published in September 1983.
- from the Blake's 7 Wiki