Whittaker, C. R., Frontiers of the Roman Empire : a social and economic study / [print] C.R. Whittaker. - Baltimore : Johns Hopkins University Press, (c)1994. - xvi, 341 pages : illustrations, maps ; 23 cm. LCCN: 93031342 Subjects--Topical Terms: Boundaries. LC Class. No.: DG59.W624.F766 1994