Why were long barrows abandoned?
Figures-
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https://www.upr.org/utah-news/2016-08...
http://www.stone-circles.org.uk/stone...
https://www.megalithic.co.uk/modules....
https://www.megalithic.co.uk/article....
https://www.researchgate.net/publicat...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
http://www.ancient-wisdom.com/cursus.htm
https://projects.arch.ox.ac.uk/IVNE.html
https://discovery.ucl.ac.uk/id/eprint...
https://en.wikipedia.org/wiki/Peterbo...
https://archaeologyathull.wordpress.c...
https://www.wildercompanion.com/2020/...
https://www.orkney.com/news/lonely-pl...
https://archaeology.co.uk/articles/ho...
https://heritageaction.wordpress.com/...
Literary Sources-
https://www.nature.com/articles/ncomm...
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The Neolithic of Britain and Ireland, Cummings, V. 2017
Prehistoric Britain, Darvill, T. 2010
Prehistoric Gloucestershire, Darvill, T. 2011