Workers digging a deep pit during the 1935-36 excavations in Chanhu-daro, Sindh. Chanhu-daro was the only American run pre-partition Indus excavations, by the Museum of Fine Arts in Boston, and led by Ernest J.H. Mackay. They revealed a highly-advanced ancient Indus manufacturing site. An illustrated 1937 article by Dorothy Mackay describing it in Finds at Chanhu-daro.
Asko Parpola speculated that the discovery of a unique sign on selas from the site may be indicative of a place name in the Indus script: See https://www.harappa.com/blog/indus-sign-place-name and https://wwwharappa.com/blog/toponym-chanhu-daro