Based on Jones & Mattingly's Atlas of Roman Britain (ISBN 978-1-84217-06700, 1990, reprinted 2007) — the source is cited in the image legend — section "The Economy", pp. 179–228.
The topographical map is from a sub-region of
File:Uk topo en.jpg, with the copyright notice {{Bild-GFDL-GMT|migration=relicense}} and original date of 7 July 2006, copy made in 2008, with the annotations removed by myself.
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{{Information |Description= Roman Britain — Industrial Production |Source=Based on Jones & Mattingly's ''Atlas of Roman Britain'' (ISBN 978-1-84217-06700, 1990, reprinted 2007) — the source is cited in the image legend — section "The Eco
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