Offline, if you read French, see:
Bordreuil, P., Pardee, D. 1990. Le papyrus du Marzeah. Semitica 38:49-68.
P. Bordreuil, D. Pardee, Nouvel examen du < papyrus du marzeah >. Semitica
50.
It script is closest to that of the Siloam inscription (Hezekiah's time).
Bibliographical note: Zevit, Ziony. Matres Lectionis in Ancient Hebrew
Epigraphy. Cambridge: ASOR, 1980.