found: Work cat.: 92-22211: Gregory, T.E. The Hexamilion and the Fortress, 1992.
found: Britannica 14:v. 6, p. 495, under Corinth, Isthmus of (traces of an ancient wall may still be seen ...)
found: Lippincott:under Corinth, Isthmus of (Isthmian wall)
found: Princeton encyc. classic. sites:p. 418, under Isthmus of Corinth (Wall of Justinian, trans-Isthmus wall)
found: Rossiter, S. Blue Guides: Greece:p. 248, under Isthmia (Isthmian Wall) p. 250 (Justinian's Wall)
found: Enkyklopaideia Papyros, Larous, Britannika, 1981:v. 23, pp. 286-287.
notfound: Ox. classic. dict.