Title Provenance of Prehistoric Obsidian Artefacts from Kul Tepe, NW Iran Using X-ray Fluorescence (XRF) Analysis Type Article Keywords - Abstract - Researchers Farhang Khademi Nadooshan (First researcher)Akbar Abedi (Second researcher)Michael Glascock (Third researcher)Nasir Eskandari (Fourth researcher)Mostafa Khazaee (Fifth researcher)