While many of the open access texts available on the Internet are also public domain, many authors and publishers have released full or partial versions of current works. For some this is an advertising method to create demand for print versions, while others are more interested in presenting their content to the widest possible audience.
The links have been divided into three categories:
General Multidisciplinary Collections
The Online Books Page from UPenn is the most extensive single collection and the University of Montana Open Textbook Catalog is one of the most comprehensive textbook searches:
National Academies Press ebooks include some of the best research coming out of the US government, plus a wealth of policy and guideline material. All books are free to read online or download as PDF, and are also available for purchase in hardcopy. Selected NAP books, in print and ebook, are included in the CONSULS library catalog.
The most recent books from NAP are: