The Roman Imperial Army of the First and Second Centuries A.D.
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135-55 Anne S. Robertson, Birrens (Blatobulgium), Dumfriesshire and Galloway Nat. Hist. and Antiq. Soc, (1975) H. Schonberger, 'Muos-Birgstad: Ein newes Romerkastell', Bex. RGK, 63 (1982) H. Schonberger, 'Plan zu den Ausgrabungen ...