I've recently discovered that William Jessup Cleaver's first Cleaver genealogy, "Some of the Descendants of Peter Cleaver", long out of print, is now available in downloadable electronic form on archive.org, in multiple formats including PDF:http://www.archive.org/details/someofdescendant00clea
Although I don't own a physical copy of this book, I've become aware (thanks to Nancy Lou Sweeney) of a few errata in the text, and have noticed a couple more on my own. They're generally typos in years - e.g., 18xx that should be 17xx, or 18xy that should be 18yx.
If anyone else is aware of any errata whatsoever, I would appreciate it if you could either e-mail me, or post them here.
Thanks, Darren Price