Environmental change in the third century.

von Porter, H.
Veröffentlicht in The Roman West in the third century. Contributions from archaeology and history
Umfang/Format: 353-362, Abb.

The Saxon conquest of Somerset and Devon.

von Porter, H.M.
Bath : James Brodie Limited, 1967.
Umfang/Format: 87 S. ; 22 cm.