Note: Almost uniquely, the report is written by 美国国务院, rather than a VOA reporter. The report has three footnotes (!), and supplies a link to an official document from which the VOA report is summarized.
Kevin Baumert and Brian Melchior, China: Maritime Claims in the South China Sea. Office of Ocean and Polar Affairs, Bureau of Oceans and International Environmental and Scientific Affairs, US Department of State, Dec 5, 2014 (under the heading "Limits in the Seas No 143").
docs.voanews.eu/zh-CN/2014/12/10/0499e83f-392b-4c6f-9450-e924853bd85d.pdf