nb: links in this section embedded in page numbers and edition numbers are through "google book search". users outside the us may not yet be able to gain full access to those linked editions. the other links such as to pep and "arisbe" do not go to "google book search". "internet archive" links generally go to book's relevant page; once there, click on book's title at pane's top for other formats (pdf, plaintext, and so forth; unfortunately, "internet archive" fails to inform reader about that).