Mark Raymond Harrington (at right), Curator of Archaeology, Southwest Museum, and E. G. Ward (at left), miner and assistant to the Gypsum Cave expedition, examining charcoal from a fire below the sloth manure layer in Room 1, Gypsum Cave. This photograph was probably taken at the Nevada expedition site in 1930.
Smithsonian Institution Archives, Accession 90-105, Science Service Records, Image #SIA2008-3336
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