Recommended sci-fi

Ran into this spiffy collection of classic science fiction at the University of Delaware. Although my first reaction was, "Where's the Vonnegut?", I was familiar with most of these and have to say it is a pretty good list. I've read enough of them to admit I like the genre, and this list gives me some ideas for a few I've missed. If you haven't read "The Sparrow", you should try it. Thank you, U.D.!