Chuck Jones kindly pointed out that two additional volumes of the Isthmia Series were available online. As orginally noted in his post from 2011 concerning open access publications of the ASCSA, Google Books has released previews of Isthmia Vol. IV. Sculpture I: 1952-1967 (Mary C. Sturgeon) and Isthmia Vol. VII: The Metal Objects, 1952-1989 (Isabelle K. Raubitschek). The previews are not complete and omit key pages, but many still be able to make use of them for research or reading.
Corinthian Matters 