A list of predominantly hard sci-fi books for your reading pleasure. I’ll loan you the ones I have, as soon as I can find them.

Click book covers to go to Amazon.

Lucifer’s Hammer ~ This is the one I told you about Tuesday. Oh YUM. A dinosaur-killer strikes the earth; hilarity ensues.

Darwin’s Radio ~ I have the second book, Darwin’s Children, in paperback. You’ll have to buy this first one.

Ilium ~ I have both this and the sequel Olympos in hardcover. Combines hard sci-fi and the classics you wish you were reading.

Code of the Lifemaker ~ I can’t remember why I liked this book so much, only that I did.

An Oblique Approach ~ This is not hard sci-fi, it’s military sci-fi/alternate history. IT’S FUCKING AMAZING; I’ve read the entire series twice. (I think I only have these in ebook format, though.)

The Boat of A Million Years ~ Solid hard sci-fi. I think I have it in hardcover.

Wheelers ~ This was a great read. Neat alien lifeforms. I used to have it in paperback; I’ll look around.

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For free sci-fi in ebook format: the Baen Free Library.
For sci-fi that’s not free, in ebook format: Fictionwise and Mobipocket.