I actually have all the books you are talking about.
The following books are by Todd Guenther, aka Mastercom:
Ships of the Starfleet, Volume One.
Ships of the Starfleet, Volume Two.
There were no more volumes in this series printed. In Volume Two he mentions a forthcoming Volume Three, but, alas, it was never printed. Beware of fan-made books you'll find on the web in pdf format that call themselves Volume Three, Volume Four, etc...they are not authentic.
The following books are by David Schmidt, aka Strategic Command:
Starfleet Dynamics
Starfleet Dynamics, 25th Anniversary Addition
Starfleet Prototype (the so called Volume Three...it was intentionally made to look like Mastercomm's. Many of the designs in both books are shared, though I do not know if the two authors worked together. Example: Belknap and Knox Classes.)
A variets of "pamphlet" or magazine style publications, later compiled into Starfleet Dynamics.
Also, be sure to checkout the Jackill three volume set, the Starfleet Reference Manual, Volume 1 through 3. Good stuff.
Most of these books can be found at eBay, some at Half.com or Amazon.com used books sections, and, I've seen them even at Borders on occasion in the used book area. Also, try a simple web search, various other Fan Club merchant sites occasionally have them.
-Lance M. Nutter, the ASDB Group,
www.trekships.org.