Many sites have done a great job preserving printed materials of the past, and I'd like to point out a few. First, is the 1940s book How to Make Friends by Telephone scanned in its entirety here.
Next up is an amazing gallery of vintage romance novels featuring nurses. You wouldn't think there'd be so damn many, but there's over three hundred! Even better, the site not only has cover images, but a description and quote from every single one.
Here's a real treat: Life's Greatest Trip by Arthur Blessit. I wish the scans were a bit bigger and they'd scanned the entire book, but it's so good, I'll take what I can get. This is hippie religion at its best: - getting "stoned on the Lord" and all that good stuff. It's one drug reference after another, all in the name of Jesus Christ Superstar.