Rama II
From the back cover of Bantam paperback December 1990:

THE RAMANS ARE BACK...

Years ago, the enormous, enigmatic alien spacecraft called *Rama* sailed trough our solar system as mind-boggling proof that life existed -- or *had* existed -- elsewhere in the universe.  Now, at the dawn of the twenty-third century, another ship is discovered hurtling toward us.  A crew of Earth's best and brightest minds is assembled to rendezvous with the massive vessel.  They are armed with everything we know about Raman technology and culture.  But nothing can prepare them for what they are about to encounter on board Rama II: cosmic secrets that are startling, sensational -- and perhaps even deadly.
Rama (Imaginary space vehicle), Fiction, Long Now Manual for Civilization, Extraterrestrial beings, Space vehicles
Gentry Lee