This 23 March 2011 article from the internal NSA newsletter SIDToday describes an analyst’s surprise at discovering that the agency was collecting internal communications from Venezuelan energy company Petróleos de Venezuela (PDVSA): see the Intercept article Overwhelmed NSA Surprised To Discover Its Own Surveillance “Goldmine” on Venezuela’s Oil Executives, 18 November 2015.

This NSA presentation from March 2009 shows how VOIP intercepts are handled in XKeyScore: see the Intercept article XKEYSCORE: NSA’s Google for the World’s Private Communications, 1 July 2015.

A Targeting Rationale document details how NSA analysts should justify their targeting decisions: see the Washington Post article NSA broke privacy rules thousands of times per year, audit finds, 15 August 2013.

This undated NSA presentation, presented together with speaking notes, provides an introduction to the main cable access programmes facilitated by the agency’s corporate partners and specifies the relevant SIGADs: see the book No Place to Hide, 13 May 2014.