Anchor Octavos
Publisher: Doubleday Books
Years: 1966-1975
Related Series: Anchor Books, Anchor Documents in American Civilization, Anchor Modern Studies in Philosophy, Anchor Natural History Library, Anchor Science Study Series, Anchor Seventeenth-Century Series
The series designation AO was for Anchor paperbacks published in any size other than 4-3/16" x 7-1/8." There are many gaps in the list below, as these titles seem hard to identify. Perhaps that's because size is the only unifying element or because the only indicator that a title is an Anchor Octavo is the AO prefix itself (which is easily misread by OCR).
PW, July 25, 1966, at 59 (announcing the introduction of the Anchor Octavo size for works that are longer than 600 pages, the limit for the regular Anchor Books)