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Estimate of the Situation Estimata clavata Estimata dhaulagirii Estimata alexii Estimata annapurna Estimata dailingensis Estimata Estimata proterva Estimata takkhalii Estimata alexisTài liệu tham khảo
WikiPedia: Estimate_of_the_Situation http://query.homestead.com/swords.pdf http://www.project1947.com/bg/ufogov.htm http://www.project1947.com/fig/1948b.htm http://www.project1947.com/fig/1948c.htm http://scholar.lib.vt.edu/theses/available/etd-050... http://www.nicap.dabsol.co.uk/Rufo.htm https://web.archive.org/web/20050920102857/http://...