One of the rarer versions of Infocom game, Dysan released a number of adventures in their own packaging for the IBM PC (and possibly other machines). Originally as evidenced by the box they were intended to be delivered on Dysan's new experimental 3 1/4" medium, however, this medium did not stick around long and so it was repackaged with standard 5 1/4" disks instead. Unfortunately this copy does not have the odd-sized disks so I have yet to see what one looks like, if it ever actually existed.
The contents of this version appear to be indentical to the 'folio' version. The manual is a different shape so it will fit in the box, but the content and page numbering are identical.