I would describe these as acceptable to good,  very well.Read. 2 are missing covers.

You get the following books,

the ring by piers, Anthony and Robert E margroff,

the deathworms of kratos by Richard Avery

vor by James Blish

voyagers II the alien within by Ben Bova

exit Earth, Martin Caidin

tales of ten worlds, Arthur C. Clarke.  Childhood's end Arthur C. Clarke,

the fountains of paradise, Arthur C. Clarke

17 X infinity Groff Conklin

, the twilight of Briareus, cowper

men and machines edited by Robert Silverberg,

forever, man, Gordon R Dickson

2010 Odyssey two Arthur C. Clarke, this one's missing the cover and most of the spine, got ripped off

the dark design by Philip Jose farmer,

the man who used the universe Alan Dean Foster, the deluge drivers, Allan dean foster

greenthieves, alan dean foster

. Nor crystal tears Alan dean foster

the last starfighter. Alan dean foster

a call to arms Alan, Dean foster

Voyage of The Star Wolf David Gerrild

assassin from tomorrow, Peter Heath

starship troopers, Robert A Heinlein

expanded universe, Robert, a Heinlein

bolo Keith Laumer

the shattered, Stars Richard s, McEnroe

black star, rising Frederick Pohl

The Starchild trilogy  Frederick Pohl and Jack Williamson

the world is round Tony Rothman

.  Legacy James H Schmitz

Venus of the half shell Kilgore Trout

galactic rift RD Warner and Michael Warner

the 1985 annual world's best SF Donald a wollheim.