Smithsonian Libraries Online BooksMost books available in the Smithsonian Libraries online books collection are in the Public Domain unless otherwise noted, and are therefore free to download, use, re-use, and re-mix without regard to copyright. All of the books in the Digital Library are available for download as PDFs and epubs, which can be read on many dedicated ebook readers. You can also download individual page images and plain text (uncorrected OCR.)