The underlying substance is Sumerian bitumen: a naturally occurring petroleum material (often called an asphalt-like “black goo”) long associated with waterproofing and adhesion, and even with ...
Reprint from the Smithsonian report for 1959. https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!926647~!0#focus ...
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