More Sci-Fi Book covers

As a young boy and teen I devoured the old science fiction novels I picked up at the used bookstore. Here are a few of the cool covers from some off my bookshelf...

(Click on images to enlarge.)

Burl realised he should have been suspicious of a videophone booth way out here.

Spreading his arms like the robot did nothing to help him get away faster.

G'nrex had 500 quatloos riding on this guy and he wasn't about to let him rabbit.

As he faded away, Sam knew he shouldn't have tried to put the space fireflies in a bottle.