Mastercom Data Center published the two technical manuals of the Star Trek Movie-era starships, published in 1991 by Mastercom Data Center. The first volume included such vessels as the various subclasses of the Constitution-class heavy cruisers, the Knox-class and Surya-class frigates, various iterations of the Avenger-class heavy frigate and foldout diagrams of the Belknap-class strike cruiser. There was a revised version of the first volume published. It's major changes were the addition of perspective drawings of ships of two of the Heavy Crusier classes. The second volume focused on Akyazi-class perimeter action ships and subclasses thereof.