Excavations in an ancient soapstone quarry in the District of Columbia Excavations in an ancient soapstone quarry in the District of Columbiav. 3No. 4321–330Holmes, William H. 1890. "Excavations in an ancient soapstone quarry in the District of Columbia." American Anthropologist, 3, (4) 321–330.More...ID: 119426Type: articleKeywords: USNM; NMNH