References Detail back created at: 2014-08-30 Media Type: Article in Journal Author Noe-Nygaard, Nanna Year: 1971 Title: Spur dog spines from prehistoric and early historic Denmark – An unexpected raw material for precision tools Download: http://2dgf.dk/xpdf/bull21-01-18-33.pdf Volume: 21 Page No: 18-33 JournalBulletin of the Geological Society of Denmark Keywords Time Period 1500 - 2000 AD European timeline Early Modern Time Super Region Europe Class of Artefact pin Theme function Material bone Miscellaneous worked bone back