The Door Through Space by Marion Zimmer Bradley. 1961. Ace Books, Inc. 
Pretty sure Walter Velez is the illustrator.
2

The Door Through Space by Marion Zimmer Bradley. 1961. Ace Books, Inc. 

Pretty sure Walter Velez is the illustrator.

Terrible 80s book design.
The Stars Will Speak by George Zebrowski. 1987.
1

Terrible 80s book design.

The Stars Will Speak by George Zebrowski. 1987.

Revolt on Alpha C, Robert Silverberg
Illustrated by William Meyerriecks
Copyright 1955, 3rd printing 1963
11

Revolt on Alpha C, Robert Silverberg

Illustrated by William Meyerriecks

Copyright 1955, 3rd printing 1963

judithsmutler:

Yesterday’s bookstore finds!

From my other blog, but it fits here, too.