Why does the north-western boundary of Wiltshire ignore the river Avon?

von Whittock, Hannah.
Veröffentlicht in Wiltshire Archaeological and Natural History Magazine, 105 (2012)
2012.
Umfang/Format: p. 96-104 : map.

The Anglo-Saxon Avon valley frontier : a river of two halves

von Whittock, Hannah, Whittock, Martyn J.
United Kingdom : Fonthill Media, 2014.
Umfang/Format: 144 pages, [16] pages of plates : colour illustrations, maps ; 24 cm.