A CIA map of Syrian and Hezbollah presence in Beirut on  26 February 1987.
Central Intelligence Agency
National Intelligence Daily: Thursday 26 February 1987. <a rel="nofollow" class="external free" href="https://www.cia.gov/library/readingroom/document/cia-rdp88t00091r000400120001-0">https://www.cia.gov/library/readingroom/document/cia-rdp88t00091r000400120001-0</a>