The Woodworks Library has a bunch of PDFs of woodworking books, mostly public domain materials from the late 1800s or early 1900s. However, some of them are more modern, like this US Army Corps of Engineers carpentry manual from 1995. [via open materials]
Update to Previous Warning:
We posted a warning about possible PDF-based malware on this link after getting email from a reader. The folks at Evenfall Studios took quick action, examined all of the files in question, and have determined that they’re squeaky clean. So the coast looks clear. Thanks to Evenfall for being on top of things and we apologize for any inconvenience or concern.