401.
Unknown Guests: Three Alien Contact Stories: Empire, the World That Couldn't Be, Hellhounds ...
by Simak, Clifford D., Gaughan
ISBN: 9788027308965
406.
Time Hole: Time Travel Stories by Clifford D. Simak: Project Mastodon, Second Childhood
by Simak, Clifford D.
ISBN: 9788027308958
420.
Empire: a Powerful Novel of Intrigue and Action in the Not-so-distant Future
by Simak, Clifford Donald
ISBN: 9789353365127