Plurality of Worlds, by Steven J. Dick

Acquired a copy of this today. It should be a good source to check my theory that Kepler was the first xenoarchaeologist/exoarchaeologist/planetary SETI researcher.

The Search for Extraterrestrial Life: Recent Developments

I've finally got my hands on a copy of this important volume! Now I can update myself on recent developments (to 1985)!