Gary Lock & Ian B. M. Ralston 
Atlas of the Hillforts of Britain and Ireland [PDF ebook] 

This book provides the first comprehensive series of maps of the hillforts of Britain and Ireland, with accompanying commentaries and broader overviews which interpret the survival and detection of this evidence in its later prehistoric and early historic contexts. The authors expertly assess and analyse the available evidence for over 4, 000 hillforts from Shetland to Cornwall to County Clare to a single standard and present their findings in both map and descriptive form. Further detailed information is available to search online via our website.