Here's a good variety of older science fiction books.
Looking through a few of the books, they seem to be from the 1950s through the 1990s. A couple of them have the covers coming loose, so these would strictly be a group to read and dispose of due to their condition.
Some of the authors are:
David Weber
David Gerrold
Thomas B. Costain
Arthur C. Clarke
F.M. Busby
And others
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