Geochemical analysis of bitumen from West Asian torpedo jars from the c. 8th century Phanom-Surin shipwreck in Thailand Alex Zumberge, Buyuk Ghorbani, Hossein Tofighian, Tom Vosmer, Seth Priestman, Madeline H. Engel, Abhirada Komoot, Thomas Van de Velde, Jacques Connan • 2020