Pre owned in acceptable vintage condition. See pictures. 7 books in total Collection of Science Fiction hardcover books written by Harriette S. Abels (1979). Published by Silver Burdett Press Silent Invaders Medical Emergency- 2 copies Green Invasion Unwanted Visitors Strangers on NMA-6 Meteor From The Moon The covers are shopworn on some of the books, but the pages are in good condition for vintage books.