See Charles Harold Dodd, “A New Gospel,” in Dodd, New Testament Studies (Manchester: Manchester Univ. Press, 1953), pp. 12–52. The paper originally appeared in the Bulletin of the John Rylands Library in 1936. A year earlier, in 1935, the editor of P52 dated it to the first half of the second century. See C.H. Roberts, An Unpublished Fragment of the Fourth Gospel in the John Rylands Library (Manchester: Manchester Univ. Press, 1935).