Author: Bova, Ben
Title: As On A Darkling Plain
Description: Magnum, 1981, 1st edition. Paperback, VG. 189pp, a nice reading copy., Paperback , no dustjacket. ISBN: 0417058705 ¶ giant alien machines are discovered operating on a moon of Saturn. Their objective - Earth's destruction.

Keywords: ISBN 0417058705, science fiction, sci fi 0417058705