Upon slavery in Ptolemaic Egypt - Westermann, William Linn, 1873-1954 (Columbia University Press, 1929)
Includes a transcription with translation and interpretation, of "Papyrus Columbia inventory no. 480," a papyrus fragment purchased in Egypt in 1926 by the library of Columbia university. The date of the document is about 198-197 B.C. cf. p. 1-2.