Slaughter, John Willis, 1878-2006-08-092011-11-012006-08-092011-11-011920-01Slaughter, John Willis, 1878-. "The natural background." <i>Rice Institute Pamphlet - Rice University Studies,</i> 7, no. 1 (1920) Rice University: <a href="https://hdl.handle.net/1911/8597">https://hdl.handle.net/1911/8597</a>.RI071001https://hdl.handle.net/1911/8597508088 bytesengThis material is in the public domain and may be freely used.articles