"Papers and reports from a conference held in Grassington on October 31st, 2009, organised by PLACE, Yorkshire Dales Landscape Research Trust, Yorkshire Dales National Park Authority."
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Prehistory in the Yorkshire Dales : recent research and future prospects. ISBN 9781906604356. Published by PLACE in 2011. Publication and catalogue information, links to buy online and reader comments.
