Coal in Roman Britain.

von Travis, John Robert.
British Archaeological Reports, British Ser. 468
Oxford : John and Erica Hedges Ltd., 2008.
Umfang/Format: XII, 270 S. : Abb., 8 Taf. ; 30 cm.

Roman body armour

von Travis, Hilary, Travis, John Robert
Stroud, Gloucestershire : Amberley, 2012.
Umfang/Format: 160 pages : illustrations (some colour) ; 25 cm.

Roman helmets

von Travis, Hilary, Travis, John Robert
Stroud : Amberley, 2016.
Umfang/Format: 188 pages: illustrations, diagramms; 25 cm.