Worlds best and original resource for human anatomy. The site features Bartleby.com's 20th edition of the famous book published in 1918.
Although Grey's Anatomy now stands on 38th edition, more than 1200 illustrations contained in this open access full text will help medical students to get a strong understanding of basic as well as detailed human anatomy. Though the book doesn't contain microscopy etc it still stands as a great reference book.
