From the last page of the book: This is the second revision (computer graphics version) of the original SSD Book #1 (designated SSD-1R2). In this edition, several ships were revised. The Federation CC, CA, CVS, CL, ECL, MS, and NCL now include the shield refits added in the Addends. The Kzinti CV and CVS have been combined. The CVL, SCS, and CVE have been given TAAS/AAS fighters. The remaining 35 SSDs are unchanged.